你必须更努力工作。
But we can try to work harder to get more money.
但我们可以更努力地工作以获得更多的钱。
They will try their best to work harder and harder until at last they succeed.
他们越来越努力工作直到最后成功。
They will try their best to work harder and harder until at last they succeed.
他们将全力以赴的辛勤工作，直到最后成功。
They will try their best to work harder and harder until at last they succeed.
他们将全力以赴的辛勤工作，直到最后成功。
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