system
n.（思想或理论)体系;方法;制度;体制;系统;身体;(器官)系统
复数： systems
（图片来自网络侵删）
There are bound to be changes when the new system is introduced.
引进新系统后一定会发生变化。
Our first task will be to set up a communications system.
我们的首项任务是架设通信系统。
The system has been in operation for six months.
这个系统已经运行六个月了。
