47天
138. 生物 (Metamorphosis)
; i& G2 {6 g- O2 M7 O开始听写在：2008-8-1 下午 07:59:05
0 U: ?* B' H+ Q6 a0 @6 l# l% nListen to a talk in a biology class, the professor is discussing metamorphosis {n.蜕变,变形,变质}. Higher animals like dogs, horses even human being look like their parents when they (are) born, there are some minor changes (that) occur (as these) animals grow, but the basic form and (the) structure stay the same, now this is called direct development, which is quiet different from metamorphosis, when lower animals like ants, flies, (or sea urchins{n.海胆} emerge {v.浮现,脱出,形成}) from the eggs, they don’t look (at) all like their parents, only after a <series> of major changes do they take on the characteristic (of) their parents, butterfly and moth provide the best example (of) what biologist call complete metamorphosis because they pass though four distinct stages of extreme changes, here is (the illustration {n.例证,插图}) of a butterfly at each of the four stages of complete metamorphosis, the first stage is the egg, butterflies usually lay their eggs on plants and these plants provide food when they transform into <larvae>, the second stage, after about months of this stage, a butterfly <larva> (spins) a cocoon (of) silk around itself, a <larva> in the cocoon is also called (pupa{n.蛹}), (so it) is known as (pupil) stage, the (pupil) stage is the period of inactivity when larva structures evolve into adult structure, depending on the species, the (pupil) stage can last from a few days to several months, when the (pupa) finally mature into the adult butterfly, it pushes its way out of this cocoon, (and cross onto a twig or tree land) and pumps blood into (the trunk and) wing until they are (full size and) strong. Now some insects like grasshopper and roaches{n.蟑螂} have only there stages, eggs, larva and adult, when an animal (skips{v.省略}) the (pupil) stage, it’s called the stage of incomplete metamorphosis, (it) is not only insects that undergo metamorphosis, frogs and toads are (the most well known example) of other form-changing animal, frogs lay their eggs in water and the eggs hatch into (tadpole{n.蝌蚪}), a (tadpole) looks more like little fish because it has tail and no legs, but it gradually loses it’s tail (and) developed into a four-legged frog.
- d/ ]7 C6 v% B以上听写编辑在：2008-8-1 下午 08:26:516 Q! p$ O9 q9 g" E1 s0 n5 }+ h' {
听写结束。共录入 1句， 325英文单词。
- l- T6 o9 A) M; F2 t& o- B开始时间为：2008-8-1 下午 07:59:05，结束时间为： 2008-8-1 下午 08:26:58，共用时
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[ 本帖最后由 eagledoudou 于 2008-8-1 21:00 编辑 ]
