許愿的用法和樣例：
例句
-
政治家在選舉前空口許愿，一旦上臺就根本不是那麼回事了。
Politicians promise the earth before an election, but things are different once they are in power. -
我父母許愿，每星期日都去做禮拜。
My parents are under a vow to go to church every sunday. -
他總是許愿，不過(guò)從不兌現。
He's always making promises, only he never keeps them.
