111. 模考(Pluto)1 J0 n% o# K* k1 ^+ [" t
开始听写在:2008-5-30 下午 08:56:06
* e X$ W3 |; l( d- } sListen to part of (a) discussion in an astronomy class, the professor is discussing Pluto, well, today I thought we’d talk about some of the reasons why Pluto’s status of planet has been debated, you see, until recently what makes planet a planet was one of the simpler concepts in astronomy, (it’s always been) deemed, so obvious, so basic that it was never officially defined, so anyway, improvements in telescopes and related to technology have led to a whole (host) discoveries in our solar system, with one result being that now even the generally accepted idea what (a) planet is (is being) challenged, or (at least) qualified, and this directly affects the status of Pluto, so, what makes Pluto so different that it could be reclassified, well, actually there’re several important differences between Pluto and (the) other planets, first, when you look at the other planets, especially the planets in the outer solar system, where Pluto orbits, you see that Pluto stands out, it’s the (odd) ball, and I’ll give you one guess why, (it’s gotta) be the size, Jupiter, Saturn And <Uranus> and Neptune, they’re (gas) giant, Pluto isn’t, exactly, compared (to) the (gas) giants, the Pluto is very different, it’s neither (gaseous) nor (a) giant, see, Pluto is (less than) half the size of the next smallest planet, Mercury, it’s even smaller than our moon, and smaller than other moons in our solar system, so Pluto is very small for a planet, maybe it’s not large enough to be considered a planet, but Pluto orbits the sun, I mean , that’s one of the things planets do, you’re right, most of people agree that (a) planet orbits (a) sun, and Pluto certainly does that, every two hundred and forty eight years, but with a (highly eccentric{n.偏心圆}) orbit, take a look at this, what I mean what I say (eccentric) is, it’s not like other planets’ orbits, instead it’s different in two major ways, one, it’s <elliptical> but the others’ (are) nearly circular, so for part of its orbit, Pluto is closer to the sun than Neptune and for the rest it’s farther away, and two, Pluto orbits on the different plane, that is, all the planet orbit the sun on the same plane, except Pluto, which orbits at (a) seventeen degree angle to the other orbits, (do) you see (where it looks like) it crosses the other’s orbits, but I don’t think why being small and having an unusual orbit (would) change Pluto’s status, I mean (it still has) most (of the) features (that the) other planets have, doesn’t it? It’s got an atmosphere, (granted it’s thin), but it’s there, it even has (a) moon, that’s true, in fact, if (it) wasn’t (for the) discovery of the Kuiper belt (rhymes with “piper”), there (probably) would not be (a) question about Pluto’s status, then what do you think, it’s, I’m sorry, in what belt, it’s the kuiper belt, it’s like a swarm of icy-rocky object (out beyond) Neptune, it turns out that kuiper belt objects, which are also called KBOs, have a lot in common with Pluto, for one, KBOs and Pluto are made (of) the same (staff), (namely) rock and ice, and for most of its orbit, Pluto is in the kuiper belt, remember (when) I said Pluto has an (eccentric) orbit, well, many KBOs do, too, for the same reason, their orbits are influenced by Neptune’s gravity, now, without going (into) too much detail, let me just say that Neptune’s gravity sort of pulls Pluto and KBOs around, this results in orbits that are <elliptical> and almost exactly one and one half times longer than Neptune’s, in light of these similarities, some suggest the Pluto’s (merely) the largest KBO found to date, now, I’m saying this because several other large kuiper belt objects have been found, some (half as) large (as) Pluto, some scientists believe that they may find other KBOs as large as Pluto, so you (are) saying that Pluto is more like a KBO than a planet, yeah, I mean, considering everything you just said, um, if Pluto were discovered today, would it even be called planet, well, let’s see, you tell me, well, I’d still call it (a) planet, like I said before, it maybe be small, but it’s got (an) atmosphere and (a) moon, it orbits the sun, come on, it’s obviously a KBO, I mean, it’s in the kuiper belt, (it’s) made (of) the same materials, (it) orbit the same way and (its way) smaller than any other planet, I think it’s clear, well, nobody knew about the kuiper belt when Pluto was discovered, so they called it (a) planet, but now, I think its status will continue to be questioned until there is an official definition for planet.
3 Q1 x; _5 I$ F/ [以上听写编辑在:2008-5-30 下午 10:02:10
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开始时间为:2008-5-30 下午 08:56:06,结束时间为: 2008-5-30 下午 10:02:11,共用时
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开始听写在:2008-5-31 上午 12:30:15
4 {% P9 J. s, g. BListen to part of the talk in the astronomy class, we’re going to talk about is the moon, our moon, first of all, the earth’s moon is unusual, why, it’s larger than other moons or satellites in the solar system, in relation to its planet, that is, its diameter is more than a quarter that of the earth, and (if) you compare the earth and the moon in terms of substance, you’ll (find) the moon isn’t much like the earth, for example, the earth has a significant iron core, but moon contains very little heavy materials like iron, that’s why its density is much lower than that of the earth, now, one time, it was believe that the moon and the earth were (formed) at the same time from the same material, (but then wouldn’t the) moon has (as) much iron as the earth, another theory is that the moon was formed (elsewhere in the) solar system, and then it was captured, (sort of speak), by earth, but study shows that the young earth would not have had enough <gravitational> force to stop a body the size of (a) moon from traveling (through) the solar system and pull it into orbit, the (newest) theory is called the big splash theory here, the (new) young earth was hit by another (big) planet, most of the colliding planet entered the earth and became part of it, but the huge impact created (a) vapor that (shed out) into space and eventually condensed as the moon, because this material (came) mostly from the earth surface crust, not the iron core, the moon contains almost no iron, well, as (plausible{a.貌似可信的}) as it sounds, it’s only a theory, and (we) can’t be sure what really happened, (that) this is how the moon originated, plenty of research remained to be done.- w; ]2 U2 Y9 r E, N* @; l
以上听写编辑在:2008-5-31 上午 12:54:43
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开始时间为:2008-5-31 上午 12:30:15,结束时间为: 2008-5-31 上午 12:54:48,共用时
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[ 本帖最后由 eagledoudou 于 2008-5-31 21:53 编辑 ]