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.
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，详情可参考heLLoword翻译官方下载
How to share your real-time location with Google MessagesYou can find the feature in the same place as the old one. To get to it, open a message and tap on the attachment icon on the bottom left. Instead of doing away with the current option, Google has split the "Location" feature into "Real-time location" and "One-time location" options. You'll have to grant location permissions if you haven't already, but that's just the first time you share.
x = mmap(0, bytes, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
。爱思助手下载最新版本对此有专业解读
Walmart to pay $100m over claims it misled drivers over pay，更多细节参见同城约会
number of rounds so that the memory is under control: