3PHRASE 取之不竭的事物;宝藏;无底洞 If you describe something as a bottomless pit, you mean that it seems as if you can take things from it and it will never be empty or put things in it and it will never be full. 取之不竭的事物;宝藏;无底洞
A gold mine is not a bottomless pit, the gold runs out.
金矿并非无底的宝藏,金子终究会被采光。
The problem is we don't have a bottomless pit of resources.
问题是我们没有取之不尽的资源。
He's a bottomless pit as far as food is concerned.