1. 云计算的类型：IaaS(Applications, Data, Runtime, Middleware, O/S)，PaaS(Applications, Data)，SaaS
  2. IaaS, PaaS, SaaS 示例：
    1. IaaS: AWS EC2
    2. PaaS: Elastic Beanstalk
    3. SaaS: Rekognition for Machine Learning
  3. 云计算收费特点：按计算时间收费，按存储容量收费，按数据读取收费(只收读出的钱不收存入的钱)

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