愚教授，你这typo也太多了吧！

来源: 于 2011-08-10 23:35:59 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

The body of （an） animal is like a mahcine such as an train engine.

oxygen gas

a digestive tract, which intakes and absort （absorbs） foods， organs which discharges waists

and legs or wings on (with) which the aninmal move（s）.