数学老师给学生反复讲解那道公式。
The math teacher tried hard to drum the formula into the students' heads.
"讨论完作业之后，教师会缓慢地、反复精细地讲解这节课的主题。
After the homework has been discussed, the teacher explains the topic of the lesson, slowly and with a lot of repetition and elaboration.
虽然为我们服务的都是志愿者，可是他们总是耐心地反复为我们讲解安全事项，还会不厌其烦地问你“好玩吗？”
Although all of the service staffs are volunteers, they always be patience to tell us the safety information and asked people everytime again and again: "have fun?"
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