观测孔

By the measures such as measuring the risk tendency of underground pressure eruption, evaluating risk index of underground pressure eruption, observing electromagnetic radiation, water injection in coal seam, long drill hole blasting, roof broken in gob area etc., realized safe coal production.

近年来鹤岗矿业集团公司的南部5个煤矿相继发生冲击地压现象，且造成不同程度的财产损失，通过采用冲击危险倾向性测试、冲击危险指数评估、电磁辐射观测方法，采用煤体注水、深孔爆破、采空区断顶等解危手段，实现了煤矿的安全生产。

It would be helpful if you put a piece of bowlers tape on the center of your ball (between the finger holes and thumb hole) so that you can watch your ball roll.

为了方便观测球在球道上的运动状态，你可以在球的三孔中心处贴上一片胶布。

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。