诸如此类的事情在户外玩的时候，会时刻盯着她，根据情况引导她。
One important thing to note about Wi-Fi range extenders (also sometimes called “repeaters”) is that most of them actually create a new Wi-Fi network when rebroadcasting your existing one. That network will have a new name (it’ll often be your default network’s name with an EXT appended at the end, unless you change it) and that means you’ll have to connect to different networks when in different parts of your home. While that’s a small tradeoff in return for improved internet connection, some will be more inconvenienced than others.
'Defensive attitude'，推荐阅读safew官方下载获取更多信息
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const i = this.arr.length - 1;。关于这个话题，heLLoword翻译官方下载提供了深入分析
记忆技巧：找「更大」→ 弹掉 ≤ 当前的（栈顶保留比当前大的）；找「更小」→ 弹掉 ≥ 当前的；找「相等可接受」→ 用 < / ，否则用 <= / =。