principal

2 篇文章
Deforestation is one ofthe principal causes of global warming.
Walden 21
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Deforestation is one ofthe principal causes of global warming. 森林砍伐是全球变暖的主要原因之一

deforestation ofthe principal global causes warming is of one
The principal daily concern of all humans...
Walden 21
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17 0 3

The principal daily concern of all humans... 所有人类日常首要关心的

principal concern humans daily of all the
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