2.2.1 混乱脚本示例（bad_spider.py）
The efficiency problem becomes obvious when you consider a user who accesses a website site many times. For example, imagine using an anonymous credential to replace Google’s session cookies. For most users, this require obtaining and delivering thousands of single-use credentials every single day. You might mitigate this problem by using credentials only for the first registration to a website, after which you can trade your credential for a pseudonym (such as a random username or a normal session cookie) for later accesses. But the downside of this is that all of your subsequent site accesses would be linkable, which is a bit of a privacy tradeoff.
，这一点在Line官方版本下载中也有详细论述
Michael returned to Silicon Valley where, following a brief run at social media analytics company Klout, he joined Uber in 2013 as chief business officer and a close lieutenant to CEO Travis Kalanick. Over the next four years, he helped orchestrate one of the most aggressive expansions in corporate history, in which Uber raised nearly $15 billion and saw its valuation soar to roughly $70 billion.
走出村部大门，春光正好。“期盼着巨轮从此通过，我们的小山村会更繁荣，好日子还在后头！”赖开井说。
但如果你想要一款足够与众不同的「安卓机皇」，三星似乎又是目前的唯一选择。