Daily Chinese Idiom Guessing Game
To give repeated orders and warnings.
令命令；申表达，说明。多次命令和告诫。
《史记·孙子吴起列传》约束既布，乃设铁钺，即三令五申之。”汉·张衡《东京赋》三令五申，示戮斩牲。”
The teacher gave the students three orders and five explanations about the exam rules.