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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他曾经带领团队做过实验，在秘鲁合法注册一家小型服装厂，结果需要耗费289天，花费1231美元，相当于当时人最低月薪的31倍。对于一个想开小作坊的穷人来说，这几乎是一堵不可逾越的墙。。关于这个话题，爱思助手下载最新版本提供了深入分析