如宇宙常数的来源问题；微调问题(fine tuning)：宇宙常数为何不为零而是如此微小； 偶然性问题(coincidence problem)：为何现在宇宙常数的能量密度刚好与背景物质密度在同一量级。
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However, the small cosmological constant and cosmic coincidence problem cannot be resolved within the known laws of physics, which is the famous cosmological constant problem in physics and astronomy.
然而现有物理学理论还无法给出合理的解释，因此宇宙学常数问题成为物理学和天文学上最重大的疑难之一。
What happened in La Gloria was an unfortunate coincidence with a big and serious problem that is happening now with this new flu virus.
奥乔亚说，“在拉格罗利亚发生的事情，很不巧与现在新病毒带来的广泛而严重的问题撞在了一起。”
That translation of the problem into action, that coincidence of the general and the particular are recognized likewise in the little artifices that belong to every great creator.
将问题转化为行动，特殊与一般的巧合，这些小把戏也出现在了每位大家之作中。
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