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N-VAR
破壞因素；禍根；陰影
You can refer to something as a blight when it causes great difficulties, and damages or spoils other things.
例句
This discriminatory policy has really been a blight on America...
這項歧視性政策確實成了美國的一大禍根。
Manchester still suffers from urban blight and unacceptable poverty.
曼徹斯特仍然受到城區臟亂和嚴重貧困問題的困擾。
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VERB
破壞（生活）；使（希望）破滅；摧毀；損毀
If something blights your life or your hopes, it damages and spoils them. If something blights an area, it spoils it and makes it unattractive.
例句
An embarrassing blunder nearly blighted his career before it got off the ground.
一個令人難堪的疏忽幾乎毀掉了他還沒有起步的事業。
...thousands of families whose lives were blighted by unemployment.
成千上萬因為失業而難以維持生計的家庭
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N-UNCOUNT
（植物的）枯萎病
Blight is a disease which makes plants dry up and die.