to arrange for yourself or for sb else to officially join a course, school, etc. （使）加入；注册；登记
You need to enrol before the end of August.
你必须在八月底前注册。
(BrE)
to enrol on a course
注册学习一门课程
(NAmE)
to enroll in a course
注册学习一门课程
~ sb
The centre will soon be ready to enrol candidates for the new programme.
中心将很快为新课程的招生做好准备。