No, I don't think every lesson should be fun. Some subjects, like maths or science, are just too serious or complicated to make entertaining. If teachers try to make everything fun, students might not take the lessons seriously and could get distracted. Also, not all teachers are good at making lessons fun, so it might not work for everyone.
不,我不认为每节课都应该有趣。有些科目,比如数学或科学,太严肃或复杂,无法变得有趣。如果老师试图让所有内容都变得有趣,学生可能不会认真对待课程,反而会分心。而且,并不是所有老师都擅长让课程变得有趣,所以这对每个人来说可能不适用。