elementary
/ˌɛləˈmɛnʧri/
easy and not involved or complicated
中文释义：基础的；简单的；初级的
The course covers elementary concepts of mathematics for beginners.
这门课程为初学者涵盖数学的基础概念。
Solving this puzzle is elementary if you follow the instructions carefully.
如果你仔细按照说明操作，解这个谜题很简单。