Pulling the mask down will start the flow of oxygen.
拉下面罩会开启氧气流。
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。
Objective To investigate the therapeutic effect of large dose mucosolvan combined variant flow rate continuous positive airway by nasal mask on neonatal respiratory distress syndrome(NRDS).
目的探讨大剂量盐酸氨溴索（沐舒坦）联合新型鼻罩持续呼吸道正压通气治疗新生儿呼吸窘迫综合征（NRDS）的疗效。
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