她担心变疯。

She was afraid of going mad.

《柯林斯英汉双解大词典》

用人们熟知的话来说，自言自语是变疯的第一迹象。

According to the well-known saying, talking to yourself is the first sign of madness.

youdao

那个人失去了控制，只是月亮的位置就能使他变疯。

That person cannot control it; just the position of the moon is driving him crazy.

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