However, evaluation methods of wall rock stability in underground cavern groups with high side-wall, large span and intersect caverns are required for actual projects such as Nuo Zhadu.
但在实际的工程中，特别是对于糯扎渡这种边墙高、跨度大、洞室相互交错的地下洞室群的围岩稳定性问题，还缺少系统的评价方法。
The sign is 15-feet high sign and covers the entire side wall of the end of terrace property.
标志有15英尺（4.5米）高，几乎占据了他家屋子的一整面墙。
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