It took another three decades before a flying sub appeared for real.

又过了三十年，一架真正的飞潜艇才出现在人们眼前。

youdao

After 1929, it took three decades before Wall Street seemed safe again, and there was almost a decade between the scandals of the nineteen-eighties and the boom of the late nineties.

1929年之后，华尔街花了三十年重新稳固其地位，从20世纪80年代的华尔街丑闻到20世纪90年代的华尔街重振雄风相隔了将近十年。

youdao

Mr Suharto ruled Indonesia with an iron fist for more than three decades before resigning in disgrace in May 1998.

ECONOMIST: Indonesia

The net benefit to seniors who retire in 2020 is roughly double the amount received by seniors who retired three decades before.

FORBES: Sorry, Seniors, You Didn't Pay for (All of) That

That was six years ahead of Row vs Wade and more than three decades before remaining anti-gay laws in the United States were struck from the statute book.

FORBES: Horsemeat for Dinner, Globalism under Fire, and the Future of the Human Condition