underprep.低于；在 ... 下；在 ... 内；在 ... 控制下adv.在昏迷中；在 ... 下adj.下面的；从属的；少于的undercrown顶部底面

1. Wall rock is a special medium of underground engineering and its stability affects directly production and safety.
   摘要围岩是地下工程类特殊的介质，其稳定性直接影响到生产和安全。
2. The tabular concrete foundation in architectural engineering is of underground engineering.
   建筑工程板状砼地基属地下工程，其施工质量的检测与控制难度较大。