The key is to study hard 或者：The key is diligence
这个你可以下一个翻译软件就可以了
翻译如下关键key; hinge; crux; linchpin都可以例句这就是问题的关键所在。This is the crux of the matter.
The key of studing English well is based on the effort you put in.
There is no absolutely right or wrong for everything in the world,the key is what's your attitude on it.
the key of the success in English study is hard work.
the key to study English is diligence
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