代课老师

Mr Li will take a surgery so he can't have a lesson temporary,the supply teacher is not decided yet.

12李老师要动手术，暂时不能来上课，谁能代课还未决定

When she heard of the only primary school in the village needs some teachers, she volunteerly askto become a free teacher.

听说当地一所民办小学缺老师，她主动跟学校要求免费代课。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。