autumn decline

基本解释

The image of autumn was embodiment of poets' plaint and symbol of decline.
秋既是骚人哀怨的体现，又是盛世衰落的象征。
Figures for American industrial production show a 1.7% decline (in annual terms) during the autumn of 1918, which translates into a 0.5% fall in overall economic output.
数据显示，美国工业产量在1918年秋季下降1.7%（以年度计算），这导致了整体经济产出下降0.5%。
But advertising revenues have been falling substantially since last autumn, with many newspaper companies seeing a decline of as much as 30 percent, compared with the previous year.
不过，去年秋季以来，广告收入已大幅度减少，很多报社的广告收入同比出现了30％的下降。

Though prices recovered somewhat during the autumn, the abrupt decline showed China's influence over all markets.
ECONOMIST: Steel industry
Big, famous boarding schools are finding it easier to fill their places—enrolments for Ampleforth in North Yorkshire are up 10% this autumn after eight years of decline.
ECONOMIST: Private education