Google只提供曲线图，没有数值参考意义不大；百度指数是个封闭系统，使用范围狭窄。Google trends数据量偏小，很多关键词查不到其trends；且Google的搜索量的值不完全真实地来源于搜索日志的统计，而是有部分采用估值，难免误差（Google Trends aims to provide insights into broad search patterns. It is based upon just a portion of our searches, and several approximations are used when computing your results. Please keep this in mind when using it. via here）。
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