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nail down + [具体事物]
此用法表示‘确定、明确’，常用于协议、细节等。
We need to nail down the exact date for the meeting.
我们需要确定会议的具体日期。
用钉子钉住；钉牢
先理解核心含义，再看它在真实句子里的用法。
用钉子钉住；钉牢
to fasten something with a nail or nails
We need to nail down the exact date for the meeting.
我们需要确定会议的具体日期。
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可生成：动词变形 Verb forms。只有点击后才会开始生成。
用钉子固定
to attach with nails
使某事(如决定或计划)确定或明确
to make something (e.g. a decision or plan) firm or certain
We need to nail down the exact time for the presentation before sending out the invitations.
在发出邀请之前，我们需要确定演讲的确切时间。
The committee met for hours to nail down the details of the new policy.
委员会开了几个小时的会，以确定新政策的细节。
Have you nailed down whether you can attend the wedding next month?
你已经确定下个月能否参加婚礼吗？
此用法表示‘确定、明确’，常用于协议、细节等。
We need to nail down the exact date for the meeting.
我们需要确定会议的具体日期。
此用法为字面义，表示用钉子固定。
He nailed down the loose board in the floor.
他用钉子钉住了地板上松动的那块木板。
此用法表示‘迫使某人明确承诺或遵守’，常用于要求对方给出确定答复。
They tried to nail him down to a specific date for the payment.
他们试图让他明确承诺一个具体的付款日期。
Not this
I nailed down the test.
Use this
I nailed the test.
‘nail down’ 意为‘确定’或‘用钉子钉住’，并非‘成功’。当表达‘考得好’时，应使用动词 ‘nail’ 作为及物动词，不加 ‘down’。
Not this
I nailed down it.
Use this
I nailed it down.
对于可分离的短语动词 'nail down'，当宾语是代词时，必须放在动词和介词之间，即 'nail + 代词 + down'，而不能说 'nail down it'。
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Use nail down naturally, then get feedback on meaning, tone, grammar, and phrasing.
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常用于被动结构，如 'be nailed down'
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.