例句：

　　We didn't know how we would cope once the money had gone.

　　一旦錢(qián)花光了，我們就不知道該怎么辦了。

　　She fell in with my idea at once.

　　她立刻同意了我的主意。

　　If you can only exercise once a week, that's better than nothing.

　　即便是一個(gè)星期鍛煉一次，也比完全不鍛煉好。

　　It was once thought that the sun travelled around the earth.

　　人們?cè)��?jīng)認(rèn)為太陽(yáng)繞著地球轉(zhuǎn)。

　　Let me hear it just once more.

　　讓我再聽(tīng)一遍。