名词
中文翻译：主针
同义词：
['main pin', 'main screw例句：1. The master pin is the most important part of the lock.（主针是锁中最重要的部分。）']
例句：
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1. The master pin is the most important part of the lock.
主针是锁中最重要的部分。
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2. The carpenter used a master pin to hold the boards together.
木匠用主针将木板固定在一起。
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3. The master pin was so strong that it could not be removed without damaging the door.
主针非常坚固，无法移除而不损坏门。