先前它只是隐匿起来了，被更加粗糙的困难所淹没，并且在这些粗糙的问题被解决之后，人们才将他们的目光聚焦在这个新问题上。
It was just hidden previously and swamped by a more crude difficulty and, when the cruder difficulty is explained away, people focus their attention on the new difficulty.
本文讨论了一种新型的智能控制方法—粗糙控制，介绍了粗糙集合理论的基本概念。
This paper discusses a new intelligent control method called rough control, and presents the basic concepts of rough set theory.
一般情况下，超疏水表面可以通过两种方法来制备：在疏水性表面构建粗糙结构或者在粗糙表面修饰低表面能物质。
One is to create a rough structure on a hydrophobic surface, and the other is to modify a rough surface by materials with low surface free energy.
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