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.
优势：时间复杂度O(d*(n+k))，d为位数，适合位数少的整数
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10Washing and drying the bulk raw material to prevent spoilage also isn’t easy. During WWII, volunteers in Britain occasionally dammed natural streams to wash the seaweeds and used hot air from a bakery to dry them. Praising the concerted efforts of volunteers, the UK Ministry of Supply concluded that “all belligerent countries should have a local source” of agar.
（三）与本案当事人有其他关系，可能影响案件公正处理的。
以前我们学的是「这个API怎么用」，以后我们学的是「这个需求怎么拆」。