飞行员在引擎故障时立即启动了紧急切断开关。

The pilot immediately hit the ___killswitch when the engine malfunctioned.

这个系统有一个紧急关闭功能，可以在检测到安全漏洞时立即停止所有操作。

The system has a ___killswitch to immediately stop all operations when security vulnerabilities are detected.

由于存在安全风险，他们不得不立即启动紧急终止开关来关闭整个系统。

Due to security risks, they had to activate the ___killswitch to shut down the entire system immediately.