A helper class should contain common used flows, such as a login function.
一个辅助类应该包含常用的流动，如登录的功能。
Since we want the contact list to be unique to each user, we will implement a login function as part of the application.
因为我们要求每个用户的联系人列表应当是独特的，所以我们将把登录功能作为应用程序的一部分来实现。
Large database contains data about more than 0.01 million types of automobiles, the data about new automobiles can be added periodically or aperiodically depending on new automobile login function.
强大的数据库内存一万多种车型数据，新车登录功能可定期或不定期的增加新车数据。
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