这三大部分是一个有机的整体，相互之间并不是油水分离、界限分明的。
The three sections form an organic whole without clear boundaries among each other.
或许，这两个应用领域根本就不能泾渭分明的划清界限。
And may be these two application areas are not so distinct from each other.
人们甚至不清楚到底是不是存在这样一个截然分明的转变界限。
It is not even clear if there exists such a sharp transition.
人们甚至不清楚到底是不是存在这样一个截然分明的转变界限。
It is not even clear if there exists such a sharp transition.
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