When we started the discussions whether we should do this again after the [first set of 2019] runs were over, our very unanimous response was that this is never going to happen again.
Iran was always designated as an "ally" of China by many in the West.，更多细节参见新收录的资料
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.。业内人士推荐新收录的资料作为进阶阅读
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