回复：my try

来源: 于 2011-10-06 13:16:02 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

 

Very good!

the Earth magnetic field - the Earth's magnetic field

confirmed from animals - confirmed for animals or confirmed by studying animals

long time ago - a long time ago (it is better with "a")