If he wants to succeed, he must work harder.
如果他想成功，他必须更加努力工作。
His work is boring but my father says that he must work hard to support our family.
他的工作很无聊但是我爸爸说他必须努力工作以维持我们的家庭。
If he is to succeed, he must work even harder.
如果他想要成功，他就必须更加努力地工作。
If a man is to succeed, he must work as hard as he can.
如果一个人要成功，他一定尽他所能地努力工作。
First, he must work out a study plan.
首先，他必须制定一个学习计划。
I have learnt that if someone wants to be a great person, he must work hard!
我懂得了如果一个人想成为一个伟大的人，他必须努力工作！
Today is my father's birthday, but he doesn't celebrate it. It's because he must work today.
今天是我爸爸的生日，但是他没有特别地庆祝，因为他今天还要工作。
He must work hard at physics, mustn't he?
他必须努力学习物理，是吗？
He must work out a strategy to deal with the coming storm.
他必须想出策略来对付即将到来的风暴。
He must work very hard in order to support his large family.
他必须拼命工作以养活他的大家庭。
He must work very hard in order to support his large family .
他必须拼命工作以养活他的大家庭。
He must work out the weight that will press on the walls and floors when the building is in use.
他要计算出，楼房建成投入使用墙和楼板要承受多大重量。
He must work out the weight that will press on the walls and floors when the building is in use.
他要计算出，楼房建成投入使用墙和楼板要承受多大重量。
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