system

The human circulatory system is responsible for transporting oxygen and nutrients through the body.

(Chinese) 人体的循环系统负责在全身输送氧气和营养物质。

The city installed a new security system with motion sensors and high-definition cameras.

(Chinese) 该市安装了一套带有运动传感器和高解析度摄像头的新安全系统。