1 PHRASAL VERB 弄清;确定 If you nail down something unknown or uncertain, you find out exactly what it is. 弄清;确定 [Also VERB n PREPOSITION]
2 PHRASAL VERB 确定(协议) If you nail down an agreement, you manage to reach a firm agreement with a definite result. 确定(协议) [Also VERB n PREPOSITION]
3 PHRASAL VERB 钉牢;钉住 If you nail something down, you fix it firmly onto something. 钉牢;钉住 [Also VERB PREPOSITION n (not pron)]
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