We do experience joy; and yet there are also long periods of depression and joylessness that also occurs for our species.
我们确实体验了欢乐，但我们物种也有长时期的沮丧与不快乐。
We do experience joy; and yet there are also long periods of depression and joylessness that also occurs for our species.
我们确实体验了欢乐，但我们物种也有长时期的沮丧与不快乐。
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