depressed block

• 沉降地块

depressed block的用法和样例：

例句

1. The Cathaysian block is more mobile in comparison with the Yangtze block.
   华夏地块相对于扬子地块是比较活动的构造单元。
2. Four types of Pb-Zn-Ag deposits occur in the middle north margin of North China Block.
   华北地块北缘中段是我国铅锌银矿床的重要富集区之一。