| 词汇 | unless |
| 词根词缀 | 词源： 1467, earlier onlesse (c.1440), from on lesse (than) "on a less condition (than)," the first syllable originally on, but the negative connotation and the lack of stress changed it to un-. 词根记忆： conj.除非prep.除…外I'm busy unless I'm blessed with less lesson.我很忙,除非我很幸运只有少量功课. |
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