// 作用：缓存当前位置右侧的"参考身高"，快速判断能看到的人
Even with the ability to take excellent photos with our phones and instantly share them across the world, there’s something magical about the old-school instant camera. With just a click of a button, you can capture a moment in a photo that you can see and touch almost immediately. Images captured by an instant camera aren’t as pristine or perfect as those produced by modern digital cameras, but their soft images and imperfections are often a big part of the allure.
。关于这个话题，heLLoword翻译官方下载提供了深入分析
（二）投放虚假的爆炸性、毒害性、放射性、腐蚀性物质或者传染病病原体等危险物质扰乱公共秩序的；
Design principles
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