Требуемый правилами, не по выбору.
Required by the rules, not optional.
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See how the word “обязательный” is used in sentences
Школа обязательна до шестнадцати лет. — School is compulsory until sixteen.
Курс включает обязательный письменный тест. — The course includes a compulsory written test.
Собрание обязательно для сотрудников на неполной ставке? — Is the meeting compulsory for part-time staff?
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