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draw-off valve
dril.	排泄阀
el.	排水阀; 排气阀
oil	泄水阀
tech.	排气 (阀); 排汽阀; 排水阀门; 泄水阀门
draw off valve
chem.	排水〔气〕阀
hydroel.st.	排水阀; 放水阀