The length of any leg of a speedcourse should be long enough so that inadvertent timing errors do not introduce appreciable errors into calculated speed.
速度课程的任何腿的长度应该够长的，以便不注意的时间安排错误不引导可感知的错误进入有计划的速度。
2
The course allows students to progress at their own speed.
本课程允许学生按各自的速度学习。
《牛津词典》
3
This course is designed so that students can progress at their own speed.