lock-in tube

例句：

1. 1. The lock-in tube is a crucial component in the security system.
   锁定管是安全系统的关键部件。
2. 2. The engineer used a lock-in tube to connect the two circuits.
   工程师使用一个锁定管将两个电路连接起来。
3. 3. The lock-in tube was designed to prevent unauthorized access to the data center.
   锁定管的设计旨在防止未经授权访问数据中心。