Baltimore in its heyday was a major centre of industrial and commercial activity.

巴尔的摩在其鼎盛时期曾是工商业活动的主要中心。

《柯林斯英汉双解大词典》

Although he continued recording and touring for decades, his commercial heyday lasted only about five years.

NPR: '60s Icon Donovan Returns with 'Try for the Sun'

But even in the city's commercial and Imperial heyday during the 19th century, it never had such a lead in relative attractiveness as it does today.

ECONOMIST: Employment