研究人员发现，在这三个城市中，在治安糟糕的区域增加绿化面积可以有效减少犯罪率。
In each of these cities, adding green space to crime-ridden areas helped reduce crime rates, the researchers found.
较低的封装分率下，组件壳程对流作用明显，有利于减少死区，充分利用膜接触面积。
Under low packing density, convection is significant in shell-side flow, which is preferable for the reduction of dead zone area and the higher utilization of contacting area.
结果：模型组的骨量明显减少，骨组织退化，出现骨小梁数目减少，厚度变薄，面积百分率下降；
Results:lumber number of bone significantly reduce, the bone organization degraded, the number of trabecular reduced, the thickness become thin, the area percent declined.
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