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Sadness “is a very functional emotion, ” Levenson says.
勒文森说，“悲伤是一种很有用的情绪。
youdao
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The tools will be easy to use, easy to maintain, very functional, and very portable.
工具将易于使用，易于维护，功能强大，很轻便。
youdao
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The tools will be easy to use, easy to maintain, very functional, and very portable.
工具将易于使用，易于维护，功能强大，很轻便。
youdao