和"简单就是美"是一个概念。相信你也知道，stupid这里没有贬义，和"傻瓜机"里的"傻"一个用法，就是易上手，易操作的意思。
附：下面是wikipedia的解释：
The KISS principle"Keep it Simple, Stupid"states that design simplicity should be a key goal and unnecessary complexity avoided. It serves as a useful principle in a wide array of disciplines, such as software development, animation, journalism, photography, engineering, and strategic planning.
我对它的的理解是：简单的，易上手的，傻瓜式的
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