There are two rats running in the kitchen.
从前有两只老鼠，它们是朋友。
Rats were given garlic oil or corn oil every other day for two weeks.
在两周内每隔几天给老鼠进食大蒜油或谷物油。
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。
Just then he heard two big rats fighting on top of the door sill.
刚好他听到有两只老鼠在门梁上打架，于是他仰起头张着嘴观斗。
Just then he heard two big rats fighting on top of the door sill.
刚好他听到有两只老鼠在门梁上打架，于是他仰起头张着嘴观斗。
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