semiautomatic private branch exchange

例句：

1. 1.The car is semiautomatic, so it only needs to be started once.
   这辆车是半自动的，所以只需要启动一次。
2. 2. The camera has a semiautomatic focus system that allows for quick adjustments.
   相机有一个半自动对焦系统，可以快速调整。
3. 3. The semiautomatic rifle is used in hunting and military operations.
   半自动步枪用于狩猎和军事行动。