可以肯定的是，“幸福”这个概念很难定义。
The idea "happiness", to be sure, will not sit still for easy definition.
至此，您对我正在讲述的概念肯定有了大致的了解。
By now you must have a rough idea about the concept I am hinting at.
然而，肯定还有许多人尽管掌握财经概念，却发现英语过于复杂。
But there must be many others who grasp the financial concepts but find the English too complicated.
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