四难，读音sì nán，汉语词语，意思是四件困难的事情；难于并得的良辰、美景、赏心、乐事四者；中医学术语。
警察机关“四难”现象的产生，有其客观必然性，不能简单归因于警察素质偏低。
There is an objective necessity to produce the "four difficult points" phenomenon in police organ, not only due to the low quality of police.
不知怎么的，他从四楼上跳下来竟然幸免于难。
Somehow he survived the jump from the third floor of the building.
我承认在实际软件项目中，上述四点都是说起来容易做起来难，而且对不同领域它们应该被不同地应用。
I admit that each is easier said than done on a software project of substance, and certainly they need to be applied differently across domains.
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