如果用于副词组， 事实上， in reality， ‘reality‘ 前不带 特定冠词 ’the‘。
reality
[ri'æləti]
n. 现实,实际,真实
例句与用法:
1. It seems as if he knew everything, but in reality, he is as stupid as can be.
他似乎是个万事通。其实他是再愚蠢不过了。
2. In reality, things always happen out of expectation.
现实中, 事情总是出乎意料地发生。
3. The current education system is not in concert with the reality.
现行的教育制度和现实并不一致。
参考资料：stardict.org