「马上」英文怎么说？at the drop of a hat
at the drop of a hat = 马上（惯用语）
at the drop of a hat 是什么意思？
at the drop of a hat：马上。出自主题「母语人士超爱用的惯用语」。
例句
- She'd help you at the drop of a hat.
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同主题还有
| hit the sack | 去睡觉 |
| cost an arm and a leg | 非常昂贵 |
| spill the beans | 泄漏秘密 |
| let the cat out of the bag | 说溜嘴 |
| hit the nail on the head | 一针见血 |
| the ball is in your court | 该你决定 |
| beat around the bush | 拐弯抹角 |
| bite the bullet | 硬着头皮做 |