Until now, the rats under study have met two of the three elements of addiction.

直到现在，研究中的大鼠符合成瘾三要素当中的二项。

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The study of trace elements was focus of clean coal technology in the world.

煤中微量元素是世界洁净煤研究的热点；

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The study of trace elements was focus of clean coal technology in the world.

煤中微量元素是世界洁净煤研究的热点；

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