如果你有一只猫，把橙和柠檬皮撒在圣诞树群上；大多数的猫不喜欢柑橘属的气味。

If you have a cat, scatter orange and lemon rinds on the tree skirt; most cats hate citrus scents.

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一群男孩聚集在一棵树旁。

A group of boys gathered around a tree.

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类群之间的差异和每个类群内部的相似性使大多数生物学家确信，生命之树只有两个树干。

The differences between the groups and the similarities within each group made it seem certain to most biologists that the tree of life had only two stems.

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