回复:my try

回答: my tryetcacct2011-10-06 12:15:19

 

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")

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回复:回复:my try -etcacct- 给 etcacct 发送悄悄话 etcacct 的博客首页 (62 bytes) () 10/06/2011 postreply 15:59:39

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