concealed piping
常见例句
- Carry out regular leakage tests on concealed piping and check for overflowing tanks, waste, worn tap washers and other defects in the water supply system.
定期检查隐蔽水管，以防漏损， 检查内部供水系统，修理有毛病的水箱、水头及其他的供水设施。
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