During its heyday one hundred years ago, the American circus was the largest show-biz industry the world had ever seen.

在它的全盛时期期间一百年前，美国马戏是世界看了的最大的演艺界产业。

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In its heyday, that is, during China’s Yuan dynasty in the 13th century AD, an Italian merchant named Marco Polo visited China and became an official in Yangzhou.

在它的繁盛的时代，就是公元后十三世纪，那时是中国的元朝，有个商人名叫马可波罗曾到过中国，在扬州作过官。

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The portrayal of figures saw its heyday during the Tang Dynasty (618-907).

人物描写看到鼎盛时期在唐代(618 - 907)。

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But RUN DMC did achieve a number of historic firsts during its heyday in the 1980s.

NPR: RUN DMC Crashes Rock's Hall Of Fame, Again

Datsun enjoyed popular success during its heyday but faltered under Nissan ownership years later and was discontinued in 1986.

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Apple's accomplishments during its heyday boiled down to a single accomplishment.

WSJ: Jenkins: Apple's New Normal