形容詞 fifty-fifty:

1. equal in degree or extent or amount; or equally matched or balanced
   同義詞：even

fif.ty-fif.ty

adj.（形容詞）
Divided or shared in two equal portions:
各半的：被分為或劃為兩個(gè)相等的部：
例句：
a fifty-fifty split.
一分為二

Being equally likely and unlikely or favorable and unfavorable:
利弊各半的：在喜歡和不喜歡或有利和不利上等同的：
例句：
had a fifty-fifty chance of surviving.
有百分之五十的幸存機(jī)會(huì)

【引伸】
fif.ty-fif.ty
adv.（副詞）