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U-boatn.

英 'ju:bəut | 美
中文n. U型潜水艇(德国的一种潜水艇)
词根词源
U-boat (n.)1916 (said to have been in use from 1913), partial translation of German U-Boot, short for Unterseeboot, literally "undersea boat."
关键词
U-boat