adj.无用的,无效的;无价值的;差劲的;不怎么样的;
例句:
She tried to work, but it was useless (= she wasn't able to) .
她很想做事,但力不从心。
He was useless at any game with a ball.
任何球类运动他都玩不好。
Their education system is useless...
他们的教育体制真差劲。