translation.en: Public agenda did a survey for us a couple of years ago where they found that 43 percent of the high school teachers in America say that they spend at least half of their time maintaining order in the classroom.
translation.zh: 公众议程在几年前做了一个调查 美国境内43%的高中老师 说他们花了至少一半的时间 来维护课堂秩序。