The diet of the affluent has not changed much over the decades.

富人的饮食数十年来没怎么变。

《柯林斯英汉双解大词典》

Calorie consumption had fallen drastically over the decades.

几十年来，卡路里消耗量急剧下降。

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Several trends have emerged over the decades.

近几十年来出现了几个趋势。

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Despite swirling changes in jazz over the decades, Blue Note has managed to stay afloat with distinguished players, from its earliest years with stride pianist James P.Johnson;

VOA: standard.2009.12.25

Relative to the whole market, It's well known that over periods of multiple decades the market has a tendency to go up.

是和整个市场相关的对吗，我们都知道经过几十年的时间周期,市场会有上涨的倾向。

麻省理工公开课 - 计算机科学及编程导论课程节选

Instead, he's known for the development of an encompassing theory of mind, one that he developed over the span of many decades.

相反，他却因为提出了极具包容性的,心理理论而闻名天下，这个理论是他通过数十年的研究才提出的。

耶鲁公开课 - 心理学导论课程节选

Each is hand-painted and employs a graphic style that has changed little over the decades.

FORBES: Dictator Chic

The portion of the workforce covered by unions plus guilds has risen over the decades.

FORBES: Declining Union Membership Does Not Mean Declining Wages

Historical changes to the inflation basket give a fascinating insight into changing fashions over the decades.

BBC: Inflation basket: E-books added by ONS