提示：点击例句中的单词，就可以看到词义解释

At first it offered online courses from four universities .

起初它为四个大学开展网络课程。

Many schools even offer part-time courses .

许多院校甚至提供在职课程。

Self-defense courses are harder to vet .

自卫课程则更难掌握。

Most cannot cope with the courses .

他们多数人应付不了课程。

Do you audit other courses ?

你旁听别的课程吗？