adj.平分为二的;
adv.对半地,平分为二分地;
例句:
I'd say she's got about a fifty-fifty chance of passing.
我会说她大约有一半的机会及格.
We two shall divide the apple on a fifty-fifty basis.
我们俩把这个苹果平分了吧.
You have a fifty-fifty chance of winning.
你赢的机会是五十对五十.