nail someone down敲定
nail sth down敲定某事使得万无一失
nail-down打钉法
nail down to束缚;翻译
Wooden Nail Down木条指甲挫
clinch that nail down把那个钉子钉牢
He Nail Down Definite他明确
definitude nail down明确
nail down the agenda安排当天的日程
PHRASAL VERB（动词词组） If you nail down something unknown or uncertain, you find out exactly what it is. 弄清
It would be useful if you could nail down the source of this tension.
如果你能弄清这种紧张情绪的根源，会是有用的。
PHRASAL VERB（动词词组） If you nail down an agreement, you manage to reach a firm agreement with a definite result. 确定 (协议)
The Secretary of State and his Russian counterpart met to try to nail down the elusive accord.
美国国务卿与俄罗斯外交部长会晤，试图确定这项表述模糊的协议。