He knew it was useless to protest.
他知道抗議是徒勞的.。
I was conned into buying a useless car.
我上當(dāng)受騙買了輛不能用的汽車。
I'm useless at French.
我的法語不太行。
It is useless to speculate why he did it.
對(duì)他為什么這么做妄加猜測毫無用處。
The measures were decried as useless.
這些措施受到指責(zé)，說是不起作用。