There were twelve of us in all for dinner.

　　我們一共十二人吃飯。

　　She often puts in twelve hours' work a day.

　　她時(shí)常每天工作十二個(gè)小時(shí)。

　　Twelve hours later she was all smiles again.

　　十二小時(shí)之后，她又喜笑顏開(kāi)了。