Each actor has its own procedures (this again logically separates the code), but they voluntarily give up control to central scheduler, which executes them sequentially (this is a form of cooperative multitasking).
每个角色有自己的过程（这又在逻辑上分离了代码），但他们自愿地向顺序执行各角色过程的中央调度器交出控制（这是合作式多任务的一种形式）。