unstable rock mass

• 危岩

unstable rock mass的用法和样例：

例句

1. So,from the great cliff's base,jut spokes of rock crossing from bank to bank,intersecting ditches until the pit's hub cuts them off from meeting.
   就像这样从岩石的基础有危岩通出去而跨越堤岸和壕沟，降到那把它们截断和集合起来的井。
2. To control the unstable rock, a thorough study is needed as to the geological status of the road's side slope and the causes of the rock's unstableness.
   在治理过程中，需要对公路边坡的地质情况，危岩的发育成因，做出较为透彻的研究。