pin down

确定, 下结论, 用针固定住, 压住

例句与用法：

It was difficult to pin down exactly what it was in her that pleased him so much.

很难确切说清她身上有什么东西使他这样动心。

She's a difficult person to pin down.

她这人行事、说话没个准儿。

词形变化：

动词过去式: pinned | 动词过去分词: pinned | 动词现在分词: pinning | 动词第三人称单数: pins |

详细释义：

1. 用针钉住

Will you pin the paper down so it won't be blown away?

请你用针把纸钉住, 不让它吹走好吗?

2. 确定

You must pin down every quotation to its author.

你一定要确定每一条引文的作者是谁。

3. 使受约束

We should pin him down to his promise.

我们应约束他遵守诺言。