B2 If something is compulsory, you must do it because of a rule or law.必须做的;强制性的;必修的
More examples
English is compulsory for all students, but art and music are optional.
They proposed making secondary education compulsory up to the age of 18.
He has just finished a stint of compulsory military service.
Attendance at lectures is compulsory.
These books are compulsory reading for students of architecture.
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