我们在清理仓库时发现了很多老鼠洞。

We found many ___ratholes while cleaning up the warehouse.

那个酒吧乱糟糟的，简直就是个老鼠窝。

That bar is so messy, it's a total ___rathole.

这个项目就是个无底洞，已经浪费了我们数百万资金。

This project has become a financial ___rathole, draining millions of our funds.