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。
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。
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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