依据典型浅埋煤层工作面的实测和模拟，发现了采场老顶初次破断的非对称现象。
By field observation and simulating test of shallow seam longwall mining, the phenomenon of main roof asymmetry breaking is discovered during the first weighting.
顶核最靠内侧，紧邻第四脑室顶的外侧和上蚓前部的内侧面，在中线两侧对称分布；
The nucleus fastigii was situated to the middle line at the anterior end of the superior vermis, and over the roof of the fourth ventricle.
这种对称性保证两边都不从对于地图的顶或者底部迫使战斗得到任何特别的利益。
This symmetry ensures that neither side gets any special advantage from forcing the battle toward the top or bottom of the map.
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