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词典资料来自柯林斯词典
♦♦ re|al|ity /ri'ælɪti/ (realities)
1 [N-UNCOUNT] ————————不可数，（广义上的），是真实的，而不是想象的
You use reality to refer to real things or the real nature of things rather than imagined, invented, or theoretical ideas.
Fiction and reality were increasingly blurred...
see also virtual reality
2 [N-COUNT] usu the N of n ————————可数，让人难以接受的真相，
The reality of a situation is the truth about it, especially when it is unpleasant or difficult to deal with.
...the harsh reality of top international competition...
3 [N-SING] ————————可以用 a reality，实际上确实存在的一件事
You say that something has become a reality when it actually exists or is actually happening.
...the whole procedure that made this book become a reality...
4 [PHRASE] PHR with cl—————————词组：in reality
You can use in reality to introduce a statement about the real nature of something, when it contrasts with something incorrect that has just been described.
He came across as streetwise, but in reality he was not.
总而言之，抽象的时候用不可数，具体到某一个则可用可数。而你的情况明显是指抽象的现实，所以不必复数。其实英语灵活性很大，具体到语境意义都不同。而高中之类的教的太死，我认为没必要把可数不可数分到那么细，把一些常规的记住，就可以应付高考了。
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