soft tunnel

• 软岩隧道

soft tunnel的用法和样例：

例句

1. It gives clear definition and classification of soft rock, and a comprehensive study has been made on the mechanism of soft rock failure.
   首先明确了软岩的定义及分类，对影响软岩隧道稳定因素，软岩隧道失稳的力学机理和变形力学机制作了较为全面的研究。