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plumb line ['plʌmlaɪn]
eng.geol.	铅直线
hydroel.st.	铅垂线
oil	垂线
railw.	铅锤线; 吊线坠
tech.	垂准线
textile	准绳
tools	测水深或垂直面用的铅垂线
wind.	垂直线

plumb line: 25 phrases in 3 subjects

Agriculture	1
Space	4
Technology	20