fall astern的用法和樣例：
例句
用作及物動詞 (vt.)
- When the engine failed, we had to drop astern.
當發動機發生故障，我們不得不落在後面。 - Derek, who was close behind, saw the ticket fall and quickly picked it up.
德里克緊跟在後面，看見車票掉了並迅速撿起來。
辭彙搭配
- fall astern 落在後面
