| 词汇 | on the back of an envelope |
| 释义 | on the back of an envelope idiom 匆忙地;粗略地 in a hurried way, without much detail The prices were very roughly calculated - it looked as though he'd done them on the back of an envelope. 计算出的价格不很精确——看上去似乎他只是粗略算了一下。 |
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