Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
Ephemeral tmpfs for all writable paths — cleanup is a single umount2 syscall, not a recursive directory walk，详情可参考一键获取谷歌浏览器下载
。同城约会是该领域的重要参考
As one commenter wrote: "This is the most i've heard this man talk in YEARS." More of this plz.
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