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A gold mine is not a bottomless pit, the gold runs out.
一个金矿不是无限的，黄金采光了。
《柯林斯英汉双解大词典》
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There isn't a bottomless pit of money for public spending.
公共开支并非用之不尽。
《牛津词典》
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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。
《柯林斯英汉双解大词典》