Drinking water is not only better for you, for some who eat lunch out every day, this simple substitution will save them over $30 a month.
喝水不仅对你，对那些每天在外面吃中饭的人更好，这简单的替代将为你每月节省30美元。
This allows us to use simple string substitution to create a service URL based on a username.
这将允许使用简单的字符串替换来创建基于用户名的服务url。
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