A holiday isn't an optional extra. In this stressful, frantic world it's a must.
休假并非可有可无。在这个紧张而忙碌的世界,它是必不可少的。
Sex education is a sensitive area for some parents, and thus it should remain optional.
性教育对某些家长而言是个敏感领域,因此应该保持其非强制性。
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