Space travel:
Not:
risky/ not naturally habitable/ hostile conditions ( extreme temperature, the lack of air and water radiation )/ afraid of the unknown/
The tips of the ice berg-冰山一角
Yes:
Awesome/Rocket/spacecraft/UFO/aliens/galaxy-milky way/weightlessness/
Eight plants:
Mercury/Venus/earth/Mars/Jupiter/Saturn/Uranus/Neptune
王牌题：
图片发自简书App
代数：Algebra 函数：function 几何：geometry 算数：arithmetic 微积分：
tips：
#introduction：（like it or a nightmare)
Math trick
#who taught you this skill
#how you learn it
#why it was useful to you
Part3
The difference:
1. Just about yourself (part one)
2. Do people/Chinese people …
What are the advantages and disadvantages of…
Firstly…
Additionally …
However…
As you can see
Also
