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2013-05-23 12:21
求翻译：There are many species of earthworms and each generally has different preferences for soil conditions. Of the 200 species found in North America only 18 have been found in Canada; only six of these are native to this country. Some species are only found within the top surface layers while others, such as Lumbricus may 是什么意思？ 待解决
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There are many species of earthworms and each generally has different preferences for soil conditions. Of the 200 species found in North America only 18 have been found in Canada; only six of these are native to this country. Some species are only found within the top surface layers while others, such as Lumbricus may
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