pit gain

例句：

1. 2. 利润，收益3.
   在采矿中
2. 1.The pit gain in the mine is a major concern for safety.
   矿井中的坑洞是安全的主要问题。
3. 2. The company suffered a significant loss due to the market downturn.
   由于市场下滑，该公司遭受了重大损失。
4. 3.The project's pit gain was expected to be substantial.
   该项目的预期利润相当可观。