Pin 是英语中的一个多义词，主要有以下几种含义：

1. 名词：大头针，别针

音标：/pɪn/

翻译：
指一种小型的针状物，通常有一个带头的金属针，用于将物体固定在某个地方，常用于固定纸张、衣物等。

用法：

She used a pin to attach the note to the bulletin board.

I need to find a pin to fix this hem.

2. 名词：销钉

音标：/pɪn/

翻译：
用于固定、连接零件的小金属钉，通常应用于机械、工程领域。

用法：

The engineer inserted a pin into the hole to secure the parts together.

3. 名词：针脚

音标：/pɪn/

翻译：
在裁缝或缝纫中，指用来将布料固定的针。

用法：

She carefully placed the pins along the edges of the fabric before sewing.

4. 动词：固定，别住

音标：/pɪn/

翻译：
将物体用针或类似的物品固定住。

用法：

She pinned the map to the wall with a few pins.

He pinned his hopes on winning the game.

5. 动词：把（人或物）按住，压住

音标：/pɪn/

翻译：
用力按住某人或某物，通常指使某物无法移动。

用法：

The wrestler pinned his opponent to the mat.

6. 名词：引脚

音标：/pɪn/

翻译：
计算机、电子设备中连接电路的金属引脚。

用法：

The microchip has several pins that connect to the motherboard.

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例句：

I need to find a pin to attach this note to the board.

She pinned the fabric together before sewing it.

He has a pin collection from various places he has visited.

She was wearing a pin on her jacket to show support for the cause.

The technician inserted a pin to lock the machine in place.

The thief was quickly pinned down by the security guards.

Pin the sheet to the bulletin board to keep it in place.

The computer’s motherboard has pins that connect to the processor.

She pinned a badge to her shirt as part of her uniform.

The pin holding the door shut came loose, and the door swung open.

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短语搭配：

Push pin - 图钉

Safety pin - 安全别针

Pin cushion - 针垫

Pin down - 按住，束缚

Pin point - 精确定位

Pin up - 别住，张贴

Pin someone down - 让某人无法反驳或逃脱