| 单词 | seal sth ↔ off |
| 释义 | seal sth ↔ offphr v [t]to stop people entering an area or building, especially because it is dangerous 封锁［某一区域或建筑］:◇following a bomb warning, police have sealed off the city centre. 因为有炸弹袭击的警报，警方封锁了市中心。 |
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