at the drop of the hat的用法和樣例：
例句
- You want to see a doctor at once.
你必須馬上去看醫生。 - I was vaguely astride the only horse.
我象騰雲駕霧似地跨在僅有的一匹馬上。 - He can sing any song at the drop of a hat.
他隨時能唱任何一首歌。 - The timetable is subject to change without notice.
本時刻表隨時可能改變，不另行通知。
辭彙搭配
- at the drop of the hat 馬上,很樂意地...
- at the drop of a hat 一發出信號(一碰)...
