在植物弱蒸腾情况下，木质部的水分处于正压状态，这种压力叫根压。
The positive xylem pressure, often occurs with low transpiration rate, is termed as root pressure.
对这种混乱状态给予一线治疗——运用持续气道正压通气使他的气道在睡眠时保持敞开——患者的情绪和认识能力，包括呼吸功能都得到了改善。
Given first-line treatment for this disorder-use of continuous positive airway pressure (CPAP) to keep his airway open in sleep-the man's mood and cognition improved, along with his breathing.
正压控制的设计原则和方法；楼梯间的通风设计以及紧急状态下HVAC系统的运行逻辑设计。
It mainly deals with the design method and principle of fire damper, positive pressure control, ventilation of stair room and running logic of HVAC in emergence situation.
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