她担心变疯。

She was afraid of going mad.

《柯林斯英汉双解大词典》

至今尚不清楚他变疯是自然原因所致，还是误服炼金丹所致——这些东西通常含有带毒物质，比如硫磺，铅，水银，砒霜和锑。

It is not known whether his insanity was due to natural causes, or to misuse of alchemical "remedies" - which often included toxic materials like sulphur, lead, mercury, arsenic, and antimony.

youdao

You know, you mix acid and base together and the thing heats up like crazy, right.

你知道，当你把酸和碱混合起来时,这东西会像疯了一样地变热。

麻省理工公开课 - 热力学与动力学课程节选