先

如果你想成功，必先付出努力。

You have to make efforts if you are to succeed.

进厕所前先敲门。

進廁所前先敲門。

Knock before entering the bathroom.

如果外頭還有人懷疑，美國是否真的是任何事都可能發生的地方，懷疑我們開國先賢的夢想今天是否依然存在，懷疑我們民主的力量；今夜，就是你們要的答案。

If there is anyone out there who still doubts that America is a place where all things are possible; who still wonders if the dream of our founders is alive in our time; who still questions the power of our democracy, tonight is your answer.

我來登記之前你可以先幫我看管行李嗎？

Can I leave my bags with you until I come to check in?

你想我们先结婚还是先生孩子？

你想我們先結婚還是先生孩子？

Do you want to get married first or have a child first?