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。

柯林斯例句

He's a bottomless pit as far as food is concerned.

他吃起东西来肚子像个无底洞。

柯林斯例句

There isn't a bottomless pit of money for public spending.

并非有用之不尽的钱用于公共开支.

《简明英汉词典》

Head tax is small, 2 cost are not heavy, 3 cost just are a bottomless pit.

头税轻, 二费不重, 三费才是无底洞.

互联网

Because of all this, paying a kid's expenses is like pouring money into a bottomless pit.

所以, 对小孩的支出就像是个无底洞.

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