bottomless

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Some hope: the money is being poured into “a bottomless pit of ingratitude”, says William Robson of the C.D. Howe Institute, a business think-tank.
一个商业智囊——C.D.豪威研究所的威廉姆·罗伯逊说，如某些人所愿，钱正流到“一个忘恩负义的无底深渊”。
But in one experiment, diners giving a 'bottomless bowl' which automatically refilled with soup, ate 73 per cent more than those given normal bowls - and didn't even realise it.
不过在一项实验中，使用“不见底”的碗喝汤的人在且安全没有意识到的情况下，会比使用正常大小碗的人多喝掉近73的汤。
And when they shall have finished their testimony, the beast that ascendeth out of the bottomless pit shall make war against them, and shall overcome them, and kill them.
他们作完见证的时候，那从无底坑里上来的兽，必与他们交战，并且得胜，把他们杀了。

Write what you want bottomless from bottom of the mind.
写从你心底想写的东西。
耶鲁公开课 - 1945年后的美国小说课程节选

Is there any risk -- do you have a bottomless pool of money for state assistance?
WHITEHOUSE: Press Briefing
And now they know they are also up against exceptional service quality and bottomless funding.
FORBES: Why China and Korea's Priorities May Decide The Smartphone Wars
The bottomless pool of liquidity around the world is the business story of 2007.
FORBES: Cheap Dollar Or Global Awakening?

If you describe a supply of something as bottomless, you mean that it seems so large that it will never run out.
If you describe something as bottomless, you mean that it is so deep that it seems to have no bottom.
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.