Juan realized then that he must present his speech at an elementary level and with a minimum of scientific language.

胡安意识到他必须把演讲设定在入门水平，并在过程中用到最少的科学术语。

I can speak Chinese at an elementary level.

我只会说简单中文。

Actually, I am good at teaching mathematics at elementary level.

实际上，我很擅长教授基础数学。

Actually, I am good at teaching mathematics on elementary level.

第二，如果他是个小学生就更好了。实际上，我很擅长教授基础数学。

Hello! Welcome to our Speaking Chinese (Elementary Level) online Course!

您好学员，欢迎进入汉语口语(初级)课程！