for (let i = 0; i < n; i++) {
这种消费心理的差异，本质上是为过程付费与为结果买单的区别。欧美游客愿意为船上的时间付钱，而中国游客更倾向于为下了船看到了什么而付钱。
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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.
The device has a Privacy Display that’s said to be the first of its kind on a smartphone. The idea here is to prevent people around from seeing what’s on the screen from acute angles. There's a small decrease in brightness when Privacy Display is active, and there are lots of customization options.