As far as possible, the teacher should expose the student to real life situations.
教师应该尽可能使学生接触现实生活的情景。
Politeness costs nothing and gains everything.
礼貌不费分文而可赢得一切。
As far as I could see, it needed only a minor adjustment: a turn of a screw here, a little tightening up there, a drop of oil and it would be as good as new.