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.
“母亲手机里存有熟悉人的联系号码，均在联系范围之内。”龙先生说，原自认为很安全了，但没想到仅几周后防线就被轻易撕开。
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能力提升是全方位的，可以完整的复述今天在幼儿园一天都做了什么，就算表达有点逻辑颠倒，但引导她顺序以后，能很好的理解并且重新复述。