Apple Watch 走的也是这条路——将健康与通知两个功能一边升级、一边剥离出来，用户需要购买额外的配件，才能解锁 iPhone 更全面的体验。
Tkachuk expresses regret over Trump joke
，更多细节参见同城约会
The White House did not immediately respond to a request for comment.
At its core, a stream is just a sequence of data that arrives over time. You don't have all of it at once. You process it incrementally as it becomes available.
and then any time I want the length, get it: