科学家们给每个百合的花瓣用点做了记号，主要的或中心纹理也做了记号。

The scientists marked a lily bud with dots along each petal 's edge and "midrib" or central vein.

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科学家让58名三岁的孩子检查一组物体，其中一个功能完好，另一个则不然。比如一部真正的电话和一个玩具电话，或者一支有用的记号笔和一支没用的记号笔。

Scientists had 58 three-year-olds examine several functional and nonfunctional objects. Like a real phone and a toy phone, or a working marker and a dried-up marker.

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后来，科学家开始在鸟的身上做记号。

But after that point, people start to mark animals.

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