试压前要先封好盲板，认真检查管路是否连接正确，有无管内堵死现象。
Seal the blind plate and check carefully whether the pipeline is correctly connected and block phenomenon in the pipe before pressure test.
从公元前三世纪到明朝（1368-1644）经过多次修建的这堵用于捍卫帝国的墙现在正在坍塌。
Built in different stages from the third century B. C. to the Ming Dynasty (1368-1644), the wall was built to defend an empire but parts of it are now crumbling.
把盘子放进水槽前也不刮干净结果把水槽堵了；
He puts a dish in the sink and doesn't scrape the plate so the sink clogs.
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