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。
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 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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