double-contact key

例句：

1. 1. The double-contact key is used to activate the security system.
   双接触键用于激活安全系统。
2. 2.The double-contact key was designed to prevent accidental activation of the system.
   双接触键的设计是为了防止意外激活系统。
3. 3. The double-contact key is a crucial component in the electrical circuitry.
   双接触键是电气电路中的关键组件。