至此我们只是学习了基本事件系统的用法。
So far we have discovered the use of the basic event system.
介绍了四元数法的基本原理及其在捷联系统中的用法；
The basic theory and the usage of quaternion are also been introduced.
主要论述层的基本知识，介绍了层的用法，并在最后给出用层来解决一个考试系统的浮动层的实现方法。
The article main elaboration level elementary knowledge, introduced the level usage, and finally is given a fluctuation layer realization method to solve an online test system.
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