高数
4.2：积分方法一：换元积分法
第一类换元积分法：
1：注意最基本的几类不定积分公式，所有的换元都建立在基本公式上，所以基本的几类不定积分公式要牢记：
（ 常数的积分，幂函数的积分，指数函数的积分，三角函数以及反三角函数的不定积分公式，平方差平方和不定积分公式。*对数函数没有不定积分）
2：换元要注意观察形式，怎样变化将微分的自变量化成和不定积分目标函数的自变量一样然后再进行换元。
英语：
长难句翻译步骤：
1：看句型是否为并列模式（是的话圈出并列词然后前后两句各自处理。
2：找各自句的主干以及主干所对应的定语和状语等。
3：运用公式，各自归位，介词短语颠倒顺序，并列不变序。
4：组合，适当修饰使其自然通顺。
词的活用：
1: we must ˇshoulder the liabiloty of protecting environment .
2: my thanks to you is beyond the ˇwords .
3: a wise man shell ˇhouse the various criticisms .
4: internet colors our lives.
5: we must fight against ups and downs in our life.
6: many students flood into working after graduation .
7: the meeting is chaired by Mr wang .
8: we are cornered when we are in trouble.
9: smoking will shadow our health .
10: back me up
11: if it's wrong , your confidence will waterfall .
rocked rise up quickly / drop wateefall
12: if we want to further our work that protect environment.
13: parrot 鹦鹉，模仿 don't parrot me
14: you can father a new idea only if you read enough.
15: please forward me your messages .
16: crown = honor He is crowned for this success .
17: his answer evidenced that he is guty .
18: such a pictures mirrors the fact that…
19: the lack of knowledge will cloude your decision .
