1.experiment with punctuation(标点)

(1)semicolon分号
①连接两个独立的小句子，联系两个概念，每个小句子都有自己的主谓宾（和从句不一样）
②分隔列表中的项目(逗号不足以分隔时)
it happened because people organized and voted for better prospects; because leaders enacted smart, forward-looking policies; because people's perspectives opened up, and with them, societies did too
(2)parentheses括号
插入事后思考、解释、额外的细节，去掉括号及里面的内容，句子主旨不可以改变
(3)colon冒号
表强调
冒号之前出现的东西必须同时有主语和动词
the hydrogen bonds are made as follows: purine position 1 to pyrimidine position 1; purine position 6 to pyrimidine position 6
that's one reason why I'm so optimistic about the future: the constant churn of scientific progress
冒号两边也可以都是完整的句子，和分号有点像，但如果用冒号的话第二个句子是在第一个句子的基础上扩展或建立的
companies use Marsh for the same reason that home sellers use real-estate agents: The agent's knowledge and experience is supposed to help the client get the right deal at the right price
(4)dash破折号
强调、插入突然的定义或者描述
不要过度使用，不够正式

2.practice, colon and dash

学会用冒号和破折号把一些重复的、碎片化的句子组合起来
之前学的准则不都是绝对的，只要仔细思考过怎么样用会更好就行了

3.parallelism(并行性)

用平行结构写句子，用“and”，“ or”，“but”连接，各部分应遵循相同的语法结构
we aimed to increase the resolution and to improve picture quality
locusts denuded fields in Utah, rural Iowa was washed away by torrents, and in Arizona the cotton was shriveled by the placing heat----locusts denuded field in Utah, torrents washed away rural Iowa, and blazing heat shriveled Arizona's cotton