These stairs are very dangerous. They should be repaired.
这楼梯很危险，应该修理了。
They agreed that the roof (should) be repaired.
他们同意应该修理屋顶了。
People always throw the old things away when they buy new things, some people claim that the broken things should be repaired and used again.
人们通常把旧的东西扔掉当他们买新的产品的时候；一些人认为破的东西补了之后还能再用。
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