例句：
1、The course allows students to progress at their own speed.
本課程允許學生按各自的速度學習。
2、He was driving at well over the speed limit.
他當時開車的速度遠遠超過了限制。
3、This course is designed so that students can progress at their own speed.
這門課的設計思路是讓學生自己掌握進度。
4、It is vital to keep a check on your speed.
經常檢查并控制你的車速是至關重要的。
5、You should always keep to the speed limit.
什么時候你都不得超過最高速度限制。