有一半的機會;正反各半的可能性
have an even chance (of doing sth)
(做某事)有一半的機會;正反各半的可能性
to be equally likely to do or not do sth
She has more than an even chance of winning tomorrow.她明天多半會贏。
釋義來自《牛津高階英漢雙解詞典》第 9 版