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dieback

noun
/ˈdaɪbæk/
/ˈdaɪbæk/
[uncountable]
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  1. a condition in which a tree starts to die from its leaves or roots backwards, as a result of disease or pollution枯死:由于疾病或污染,树木开始从其叶子或根部倒退的状况
    • The leaves of this tree show signs of ash dieback.这棵树的叶子显示出灰烬复生的迹象。
    • Dieback is killing trees in many areas of Auckland.死背正在奥克兰的许多地区杀死树木。

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