The result shows that the damage of rock surrounding tunnel mainly depends on the natural stress.
结果表明巷道围岩的损伤主要与地应力有关。
The thesis demonstrates the feasibility of natural ventilation to control concentration of noxious gas in the sewer tunnel.
并论证利用自然风稀释污水隧道内有害气体浓度的理论可行性。
Made of plywood, cardboard, wooden planks and some clever mixture for tubing, this tunnel looks very natural.
这节隧道由胶合板、厚纸板、实木板和一些巧妙混杂的管道组成，看起来非常自然。
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