令人震惊地，这种毫无作用又危险的外科手术直到20世纪30年代才结束。

Shockingly, this useless and dangerous surgery did not end until the 1930s.

《柯林斯英汉双解大词典》

一些公司在70年代停止生产这些化学品，他们被发现这些化学品是危险的。

Companies stopped manufacturing these chemicals in the 1970s, after they were found to be dangerous.

youdao

回溯到1930年代，这确实变成了个危险的节日。

Back in the 1930s, it really became a dangerous holiday.

youdao

回溯到1930年代，这确实变成了个危险的节日。

Back in the 1930s, it really became a dangerous holiday.

youdao