很高兴为你解答。
The truth about something is all the facts about it, rather than things that are imagined or invented. 实情; 真相
A truth is something that is believed to be true. 真理
You use reality to refer to real things or the real nature of things rather than imagined, invented, or theoretical ideas. 现实
You say that something has become a reality when it actually exists or is actually happening. 事实存在; 真实发生的事