U-boats
(U-boat 的复数) n. 潜水艇
🧩 词语组成解析
n. 船艇；船（boat的复数）
🗣️ 情景例句
If you don't think it's any good, Please say so.
如果你认为写得不好，请照实说。
The days are getting longer.
白天越来越长了。
All the biscuits that were sent were carefully weighed.
凡送来的饼干都仔细地称量。