问题的关键 meaning in English

crux of the matter

Ay, that's the substance of it .
啊！这是问题的关键！
The point is, that as far as i can see, everything's cracking up .
我看问题的关键是一切都乱了套。
The crux comes with the question of how well the plant grows in the mixture .
问题的关键是植物在混合物中怎样才能生长得好。
Upon myword , you ' ve a very precise grasp ofthe matter
的确，你找到了问题的关键
But that ' s not the point . i ' m not hung - over -
可这不是问题的关键，我根本没喝醉

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