在造墙之前
Before building the wall
以上为机器翻译结果,长、整句建议使用 人工翻译 。
想想筑墙的方法:,在发明起重机之前,一面提前造好的的墙,由人力推起。
Think of the way walls get put up: a prefabricated wall before the invention of the crane and the pulley has to be pushed up by a bunch of people.
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