词典释义：
[no obj.][no obj.](typically of something regarded as good)become smaller, fewer, or less; decrease
（尤指好的事物）变小，变少；减少，降低
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the birth rate continued to decline .生育率继续下降。
diminish in strength or quality; deteriorate
减弱，下降；恶化
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her health began to decline 她的健康状况开始恶化
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[as adj.
declining ]declining industries .衰退的产业。
[with obj.]politely refuse (an invitation or offer)
谢绝，婉言拒绝
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Caroline declined the coffee .卡罗琳推辞不喝咖啡。
[with infinitive]politely refuse to do something
谢绝，拒绝
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the company declined to comment .该公司拒绝做出评论。
[no obj.](especially of the sun)move downwards
（尤指太阳）下沉。
〈古〉 弯曲；低垂。
[with obj.](in the grammar of Latin, Greek, and certain other languages)state the forms of (a noun, pronoun, or adjective) corresponding to cases, number, and gender
（拉丁语、希腊语和某些其他语言的语法）使（名词，代词，形容词）变化词形。
a gradual and continuous loss of strength, numbers, or quality
日渐衰弱，持续减少，不断下降
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a serious decline in bird numbers 鸟的数量的严重持续减少
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[mass noun]
a civilization in decline .日渐衰落的文明。
a fall in price or value
（价格的）下跌，贬值
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the decline of world coffee prices .世界咖啡价格的下跌。
〈古〉 夕阳渐沉。
〈古〉 消耗病（尤指肺结核）。
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declining years the period of one's old age （人的）老年时期，垂暮之年 -
the period leading up to the end of an enterprise or institution （企业或机构的）式微时期，衰败期，没落期
the declining years of the Austro-Hungarian empire . 奥匈帝国的没落时期
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decline from ... to ... 从...减少到...
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decline by ... 减少了...(幅度)
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the (small) decline (小幅)下降
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in decline 正在衰退
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in decline 下降；衰落
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a rapid/sharp/gradual decline 迅速╱急剧╱逐渐下降
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decline to do 拒绝做某事
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"late Middle English： from Old French
