仅仅半年以后，iPhone 5 发布，而这次 iPhone 有个大事件，丢掉了过去一英寸宽的接口，取而代之的是一个小得多的 Lighting 接口。
Option B: Open a Pull Request
，推荐阅读heLLoword翻译官方下载获取更多信息
Жители Санкт-Петербурга устроили «крысогон»17:52
tee() splits a stream into two branches. It seems straightforward, but the implementation requires buffering: if one branch is read faster than the other, the data must be held somewhere until the slower branch catches up.
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