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VERB
（一段时间后）失去吸引力，变得乏味
If something palls, it becomes less interesting or less enjoyable after a period of time.
例句
Already the allure of meals in restaurants had begun to pall.
饭店里的饭菜已经不像以前那样诱人。
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N-COUNT
一团烟雾状物
If a pall of smoke hangs over a place, there is a thick cloud of smoke above it.
例句
A pall of oily black smoke drifted over the clifftop.
一团油腻的黑色烟雾飘到悬崖顶上。
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PHRASE
给…蒙上阴影
If something unpleasant casts a pall over an event or occasion, it makes it less enjoyable than it should be.
例句
The unrest has cast a pall over what is usually a day of national rejoicing...
动荡的局势给往常举国欢庆的日子蒙上了阴影。
We don't want to cast a pall over the festivities.
我们不想给庆典蒙上阴影。