simultaneous calling key

例句：

1. 1. The SCK is a crucial component in the modern communication system.
   同步键是现代通信系统的关键组成部分。
2. 2.The SKC allows for seamless communication between devices, ensuring synchronization without delay.
   同步键允许设备之间无缝通信，确保无延迟的同步。
3. 3.The SCK is often used in emergency situations to ensure quick and accurate response times.
   同步键在紧急情况下常用来确保快速而准确的响应时间。