nail down造句

Will you nail down that loose board in the floor?
请把那块松动的地板钉牢好吗 ?

It would be useful if you could nail down the source of this tension.
如果你能弄清这种紧张的根源，将会大有益处。

It took the negotiators ten hours to nail down a deal.
参加协商的人花了十个小时才敲定一桩生意.