情绪可以被定义为一种短暂而温和的积极或消极的感觉，它是泛化的，不受任何特定环境的约束。

Mood may be defined as a temporary and mild positive or negative feeling that is generalized and not tied to any particular circumstance.

youdao

定义玩耍的功能是困难的，因为这些功能可能是长期性的，其积极影响要到动物成年后才会显现。

Determining the functions of play is difficult because the functions may be long-term, with beneficial effects not showing up until the animal's adulthood.

youdao

但是积极和消极的定义究竟是什么呢？

But what are the definitions really of positive and negative?

youdao

We've expanded our list of goods so that-- Nobody's going to deny that among the goods of life are pleasure and other positive experiences.

我们扩展了美好事物的定义-,所以没有人会否认,美好事物包含愉快和积极的体验。

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