A strong point of his system is that the fast learner makes progress very fast and the slow learner can take as long as he needs.

他这套系统的一大优点是学得快的人可以飞速长进，学得慢的人则可以有充足的时间直到学会为止。

youdao

The fast and slow waves can both propagate in the waveguide system.

快波和慢波都可以在这种波导中传播。

youdao

If flow is too slow, prices are raised. If it is too fast, prices are lowered. It is the kind of system that is set to become more widespread.

如果车流速度太慢，收费就会调高。反之如果太快，收费就会降低。这种系统的使用很可能会日益广泛。

youdao

Technical tinkering, such as changing the formulation of a drug from a fast-acting pill to a slow-release system, is a common tactic.

ECONOMIST: Prescription drugs