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to phrases
dash and dot line
dril. 点划线; 工程图中心线
oil 中心线
dash-and-dot line ['dæʃ(ə)n'dɔt'laɪn]
met. 点划线
tech. 点画线
dash and dot line: 6 phrases in 5 subjects
Architecture1
Desert science1
Metallurgy1
Oil / petroleum2
Technology1