老师们准时开始，准时结束，一个字也没对学生多说就离开了教室，很少被提问者拦住。
The teachers began on time, ended on time, and left the room without saying a word more to their students, very seldom being detained by questioners.
应用程序对全局事务的开始和结束进行了定义，在事务界限内获取资源，并且通常决定是否提交或回滚每个事务。
An application program defines the start and end of a global transaction, accesses resources within transaction boundaries, and usually decides whether to commit or roll back each transaction.
与需求结合来开始并结束项目对PM的工作是非常必要的，并且还令其区别于其他的企业管理角色。
This combined with the need to commence and conclude projects are very essential to a PM's job, and also make it different from the other enterprise management roles.
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