You take great strides, building up speed, until you reach a good steady pace.

你大步行走，慢慢加速，直到步伐稳定。

Or let's try it then in 80 minutes, So we're slowly building up speed, and that's how we would help that type of student.

或者让我们在 80 分钟内尝试一下， 所以我们正在慢慢提高速度，这就是我们帮助这类学生的方式。