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This CSS Proves Me Human，详情可参考PDF资料
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The sound is high quality for smart glasses, though obviously they compare poorly to the best wireless earbuds. I found they have minimal (but not non-existent) sound leakage. When watching movies, TV shows, and YouTube videos, I was happy with the sound. I did experience some technical issues, however. When connected to my MacBook, I could not get the RayNeo Air 4 Pro to play audio instead of the MacBook speakers. That could be an Apple problem, of course.，推荐阅读快连下载安装获取更多信息
No matter what you assign to the b, it will be false since either the left or the right of the && operator is false.