n.精神失常；精神病；愚行
It's sheer lunacy driving in this weather. 天氣這麼壞還開車，簡直是瘋了。
Bridge designers had anticipated such lunacy and invented the crossing guard. 吊橋的設(shè)計(jì)者早就預(yù)料到會有這樣的精神病穿越吊橋，因而設(shè)計(jì)了防護(hù)裝置。
