自记加速计加速者

例句：

1. 1. The engineer used a self-timerto measure the time it took for themachine to complete its task.
   工程师使用自计时器来测量机器完成任务所需的时间。
2. 2.The student used a self-timer toensure that he had enough time to finishhis homework before the exam.
   学生使用自计时器以确保他在考试前有足够的时间完成他的家庭作业。
3. 3. The teacher used aself-timer to help students practice theirtime management skills.
   老师使用自计时器帮助学生练习他们的时间管理能力。