备考模版：
1）、当教授讲课内容的组合形式为第1-8种1X+2Y组合时，用如下模板：
▲ 转述教授讲的1个主题：
In this lecture, the professor talks about / discusses about / introduces about two Ys of X.（10 sec）
▲ 转述教授讲的2组要点、解释和例子：
The first ________ is (called / about) 名称 ，(which means that) 解释 .
For example, 例子（注意时态变化）. (25 sec）
The second ______ is (called / about) 名称 ，(which means that) 解释 .
For example, 例子（注意时态变化）. (25 sec）
* 转述教授额外补充的内容：
The professor also mentions / says that内容.（Also, What’s more，In addition, Additionally,）
▲ 时间花不完，就总结。
So, these are the two Ys of X presented by the professor.
2）、当教授讲课内容的组合形式为第9种1X+2Y组合时，用如下模板：
▲ In this lecture, the professor introduces a principle. According to this principle,
原理的具体含义. (15 sec)
▲ The professor uses a controlled experiment to explain this principle.
Two groups of _________ were required to _________. (15 sec)
▲ The first group of ___________________. __________. (15 sec)
However, the second group of _________. __________. (15 sec)
或Compared with group 1, group 2 ______. _____.
