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to phrases
pipe tunnel
ecol. 管子地道
eng.geol. 管式隧道
hydroel.st. 管式隧洞
nautic., tech. 管隧
tech. 管子隧道; 管弄; 管沟; 管道隧洞
pipe tunnel
: 5 phrases in 3 subjects
Nautical1
Space1
Technology3