书籍经过严格编辑和校对，内容结构清晰，是网络文本难以替代的高质量语料。
/usr/local → /var/usrlocal
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B. User Route Request (Query Time - this is what happens on your device):
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.
A comparable amount of CO2 can be stored, to the volume of oil and gas that's been extracted, he added, suggesting an operational lifespan for CCS sites of 10 to 30 years.