money pit别理解成“金钱陷阱”，真实含义是大钱坑，花钱无底洞。

【例句】
We don't want the project to become a money pit.
我们不希望这个项目变成一个要不断投钱进去的无底洞。

Old houses can become money pits for their owners.
老房子可能成为要业主不断投钱进去的无底洞。