1、ROI is not an exact science and will vary from one organization to another.
ROI并不是一門精確的科學，不同組織間的變化非常大(和SOA本身非常類似)。

2、There is no exact science for knowing how many players the game will have.
沒有什么方法能夠精確地估計游戲會有多少玩家。

3、Don't think of watering as an exact science where every drop must be measured.
不要以為澆水是一種精確的科學，以至于每一滴用水都要精密地測量。

4、It can be built up as an exact science by the reasoner.
推理法可能被推理學者們逐步樹立為一門精密的學科。

exact science翻譯