Pulling the mask down will start the flow of oxygen.
拉下面罩会开启氧气流。
Strengthen comprehensive control mask supplies, improve the comprehensive oxygen flow control patients.
加强综合性的面罩给养控制，改善患者的综合性氧气流量控制。
Based on the digital mask technique, the distribution of sand area density and the sediment-transport rate in flow field were obtained.
采用图像处理的数字掩码技术，处理图像得到了沙粒在流场中的面密度以及单宽输沙率。
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