我想弗洛伊德主义者要说的就是，你将要期望系统的差别。

I imagine that what a Freudian would have to say is, you would expect systematic differences.

youdao

这部分是因为乐观主义者和悲观主义者在应对挑战和失望的方式是有很大差别的。

In part, that's because optimists and pessimists deal with the same challenges and disappointments in very different ways.

youdao

Finally, behaviorists believed there were no interesting differences across species.

最后，行为主义者认为,生物种群之间并不存在太大的差别。

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