elementary event的用法和样例：
例句
- So far we have discovered the use of the basic event system.
至此我们只是学习了基本事件系统的用法。
elementary event的相关资料：
临近单词
elementary set
elementary
Elementary Introduction of Sectional Hard-core
Elementary conditions for petroleum accumulation
elementary electric quantity measuring instrument
elementary-organic-compounds primary explosive
ELEMENTARY INTRODUCTION OF UNDIRECTIONAL MEASUREMENT
Elementary Introduction to Natural Self-Similarity
