they must work hard
他们必须努力工作
以上为机器翻译结果，长、整句建议使用 人工翻译 。
He said they must work hard.
他说他们必须努力工作。
youdao
He said that they must work hard.
他说他们必需高兴工作。
They said that they must work hard.
他们说自己必须努力工作。
They must work hard to escape poverty by going to school, do a good job at work and not be involved in crime.
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Many do not have a clear understanding of how much hard work and commitment they must invest to ensure their own future.
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At the same time, the U.N. must work hard at selling its peace plan to neighboring nations, so they will rein in their proxies in Afghanistan.
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