Then they try to teach the students something with a specific presentation style, like using visual aids, and do a follow up test to see how much they learned.
2019年12月六级真题(第二套)听力 Section C
柯林斯高阶英汉双解学习词典释义
N-UNCOUNT
艾滋病;获得性免疫缺陷综合征
AIDS is a disease which destroys the natural system of protection that the body has against other diseases. AIDS is an abbreviation for (缩略=) 'acquired immune deficiency syndrome'.