快乐—真正的快乐—可以划分成两种类型，心理学家们这样认为。
Happiness — genuine happiness — can be divided into two categories, according to psychologists.
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现有的模式可以被分成三大类型。
The current models can be broken down into three main categories.
我们可以把动物分成数种类型。
We can group animals into several types.
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