During these periods the birds will lie on the cage floor as if trying to lay or hatch eggs.

这些时期，鸟儿会趴在笼底，好像在下蛋或孵蛋。

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The treated mice were able to remember to avoid parts of a cage floor where they had earlier been exposed to a mild stimulus.

接受药物的老鼠能够记住避开曾在笼中遭受过轻微刺激的地方。

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It was hard to make out through the nighttime shadows, but there was a strange box in the middle of the floor, like a little wooden cage.

很难看清夜里黑沉沉的房间，不过在中央有一个古怪的箱子，像是一个小小的木笼。

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