concealed piping
常見例句
- 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.
定期檢查隱蔽水管，以防漏損， 檢查內(nèi)部供水系統(tǒng)，修理有毛病的水箱、水頭及其他的供水設(shè)施。
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