Just then he heard two big rats fighting on top of the door sill. He looked up to watch the fight.

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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In the latest study, Italian scientists gave rats either cows' milk or asses' milk to drink on top of their usual food.

在最近的研究，义大利的科学家给老鼠平常的食物外，再给牠们喝牛奶或驴奶。

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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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The reality, however, is that New York's rats are highly stressed nocturnal creatures, besieged by traps, poison and sharp-shooters, struggling to stay on top of their own social hierarchy.

ECONOMIST: Rats