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.
Jim Lovell had been to the Moon twice, witnessed Earthrise and narrowly avoided a cold death in space - and saw no reason to falsely burnish his résumé.
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The creator, who uses the online handle RadialB, says he didn't expect to spawn copycats or be politically provocative. He says his content is intended to be funny - but that he also wants people to believe his fake scenes are real to grab their attention.
GUESS母公司Authentic Brands Group（以下简称“Authentic”）向界面时尚确认了中国全线闭店消息，并表示正在进行中国市场战略调整，具体进展尚未披露。
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最后，通过开源走向全球，如今，其海外收入已经超越国内市场。
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