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valley line
desert. 谷底线
hydroel.st. 谷线
tech. 沿溪线【道】; 最深谷底线【地】; 线; 河谷线; 合水线; 深泓线; 山谷线; 线
valley line
: 7 phrases in 5 subjects
Desert science1
Engineering geology1
Oil / petroleum1
Rail transport1
Technology3