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这几天我们家装修,我发现工人叔叔砌墙时,砖头是交错垒起来的,而不是一块块整齐地垒上去的,这是为什么呢?
The past few days, our home decoration, I found the worker uncle wall, the brick is staggered up, rather than block neatly go up, which is why?