与“买一个品牌”不同，这种方式更像是在现有能力边界上做延伸，风险更可控，但回报节奏也相对较慢。
func extract2(c chan task) []task {，更多细节参见爱思助手下载最新版本
Still, it is much closer Modern English than we might think.，这一点在快连下载安装中也有详细论述
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