a U-boat + verb
作主语时，常用被动语态。
A U-boat was sighted off the coast.
海岸外发现了一艘潜水艇。
潜艇；潜水艇
u-boats — plural of u-boat
一种窄长的实用推车,两端有高把手,用于运送零售商品,因形状大致呈大写字母U而得名。
a submersible warship usually armed with torpedoes
一种窄长的实用推车,两端有高把手,用于运送零售商品,因形状大致呈大写字母U而得名。
A narrow utility cart with tall handles on both ends that is used to carry loads of retail products to be sold, so named because its shape is roughly that of a capital U.
The naval museum displays a U-boat that was captured in 1943.
海军博物馆展示了一艘1943年被俘获的U型潜艇。
用法提示：U-boat 是名词，在句中作宾语，指军用潜艇。
A U-boat surfaced quietly near the island early in the morning.
清晨，一艘U型潜艇在岛屿附近悄悄浮出水面。
用法提示：U-boat 是名词，在句中作主语，表示潜艇。
The patrol plane reported two U-boats near the convoy.
巡逻机报告说船队附近有两艘U型潜艇。
用法提示：U-boats 是 U-boat 的复数形式，在句中作宾语，指多艘潜艇。
作主语时，常用被动语态。
A U-boat was sighted off the coast.
海岸外发现了一艘潜水艇。
及物动词后接U-boat作宾语。
The destroyer sank a U-boat.
驱逐舰击沉了一艘潜水艇。
U-boat用作定语修饰名词。
U-boat warfare terrorized the Atlantic.
潜水艇战使大西洋陷入恐怖。
grammar · medium
易错句子The Japanese navy used U-boats during the war.
正确表达The Japanese navy used submarines during the war.
“U-boat”特指二战期间德国的潜艇，而非泛指任何潜艇。
grammar · medium
易错句子An U-boat was spotted near the coast.
正确表达A U-boat was spotted near the coast.
“U-boat”以辅音音素/j/开头，因此不定冠词应用“a”而非“an”。
submarine泛指所有潜水艇，U-boat特指德国潜艇
submersible是潜水器，通常较小且无人驾驶，而U-boat是载人潜艇
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