N an endless or unfailing source of supply 取之不尽之物
I've never known a gas cylinda last so long. I was beginning to think I'd got hold of some kind of widow's cruse.
我从不清楚一个煤气罐可以用这么长时间，我开始认为我得到一个聚宝盆了。
In Susan's courtyard, the little well is a widow's cruse, which never dries, even in the severe season of drought.
苏姗家院子里的小井有着取之不尽的水，再干旱的季节都不会干涸。
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