学校组织同学们到郊外的路边植树,为了活跃气氛,三、四年级的老师们提议进行一次比赛,看是四年级的同学植树多还是三年级的同学更能干。老师把责任路段分为大小相等的两段,哪个年级要是先把自己的任务完成,可以帮助 The school organized the students to plant trees on the roadside in the suburbs. In order to have an active atmosphere, the third and fourth grade teachers proposed a contest to see whether the fourth grade students planting tree or third grade students were more capable. The teacher divides the responsibility section into two sections of equal size, and which grade should finish his task first can help