Scattering style education achieves its goals mainly through the education support system of a website. It is necessary to learn about the design principles and main components of...

分散式教学主要通过网站的教学支持系统来实现，要了解和掌握网站教学系统设计的原则和其主要组成部分。

youdao

Though oil is a sensitive topic for many Mexicans who learn state ownership is one of the three main principles of the constitution, its production has fallen year after year.

NPR: Mexico's Ruling Party Says 'Yes' To Energy Reform