By the 1990s most agricultural problems seemed to have been solved.

上世纪90年代，大部分农业问题似已解决。

youdao

By the 1990s, cities were starting to ban motor scooters, creating an opening for electric bicycles.

到了上世纪90年代，中国城市开始限制摩托车，为电动自行车的登场创造了条件。

youdao

Japan's growth averaged 9.5% in the two decades to 1970, but slowed to 4.7% in the 1970s and to only 1% by the 1990s.

在70年代前的二十年里，日本的经济增长平均为9.5%，但在70年代放缓至4.7%，而到了90年代仅仅为1%。

youdao

"It's a curriculum that helped Singapore math students skyrocket to number one by the 1990s and that's where they've stayed ever since."

VOA: standard.2010.08.10

Today's announcement comes after an-ongoing investigation by the Serious Fraud Office into BAE that dates back to the 1990s.

VOA: standard.2009.10.01

The case dates back to the 1990s when Mr.Gul was a senior member of the Islamist Welfare party which was closed by the constitutional court.

VOA: standard.2009.05.20

By the 1990s, Chicago had started to capitalise upon, rather than avoid, its gangster history.

BBC: Chicago��s celluloid city

By the 1990s they were both doing Elvis shows in the area, he said.

WSJ: Man Charged in Ricin-Tainted Letters Case

By the 1990s, Kim was running one of the biggest businesses in the world.

CNN: ASIANOW - TIME Asia | South Korea: Overworked