adj.在两者之间
They think they'll win the election easily, but there's many a slip 'twixt cup and lip. 他们以为能在选举中轻易取胜，但事情往往会功败垂成。
adv.在两者之间；不走极端
prep.在 ... 之间；在 ... 中间；由 ... 到 ...
