The professional monitoring stations and macro-observation networks have played important roles in predicting earthquakes in the Beijing area.
由专业地震台站和宏观观测网点组成的地震前兆监测台网对北京地区的地震预报发挥了很大的作用。
At present, the research of this field is still at the stage of macro-observation. This research field is continually widening, and the existing researches are deepening.
目前，该领域的研究尚限于宏观现象观察阶段，其研究范围在不断拓宽，既有的研究也在进一步深化，但还有许多问题有待进一步探讨。
The abrasive erosion pattern of the impeller blades of a used slurry pump is investigated by macro observation, and analyzed by SEM method.
对一个实际清淤中磨损失效的泥浆泵轮叶片表面进行宏观观察，并利用扫描电镜作了微观形貌分析。
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