去买东西而不带钱是很蠢的.It is idiotic to go shopping with no money.人们有时做出愚蠢的事情 -- 真正非常蠢的事情.People sometimes do foolish things -- indeed, very foolish things.再蠢的渔翁也不至于钓青蛙.It is a fond fisher that angles for a frog....