关于鸟类飞行的起源，传统上提出了两种对立的假设：“地栖说”和“树栖说”。

Two opposing scenarios, the "arboreal" hypothesis and the "cursorial" hypothesis, have traditionally been put forward concerning the origins of bird flight.

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现在我们得到了两种对立的解释

So we've got two rival explanations.

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康德的天才之处在于，他发现了一条综合这两种对立观点的途径。

Kant's genius was finding a way to synthesize these two opposing views.

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These are just two incompatible moral positions that Machiavelli states but he goes further than this.

这是马基雅维利所言的两种不可调和的,对立道德立场，但是他并未就此善罢甘休。

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So we've got two rival explanations.

现在我们得到了两种对立的解释

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