假设你正在建造一座桥梁，如果工程已经进行到一半，那么客户就决不会说：“天哪，我想这座桥要是建在河流的下一个弯口的话就更加实用了。”

If you are building a bridge that is half completed, the customer is not going to say, "Gee, I think the bridge would be more useful at the next bend in the river rather than over here."

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正在建造中的那座桥将是中国最长的大桥之一。

The bridge being built there will be one of the longest in China.

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河流上正在建造的一座新桥有209米宽…

The river on which a new bridge is being built is 209 met…

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