环头螺钉

In fear of screw breakage, the rst 10 cases had soft cerical collar for 12 weeks, but 2 had undesired occipitoatlantal fusion.

由于害怕螺钉断裂，头10个病人使用软颈托12周，有2例出现不希望的环枕融合。

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。