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The Trump administration's crackdown on immigration is also curbing population growth. That makes it harder to find workers, but it also means fewer are needed.
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下足券外这三重功夫，相信，更多游客能乘兴而来、满意而归，更多地区将实现留客又留心。
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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