Based on the leakage problem of exterior wall, the paper presents the principle of "negative pressure and cavity" by analyzing the construction technology of face brick wall.
针对饰面砖外墙渗漏现象，通过对饰面砖施工工艺分析，提出了“空腔负压”原理。
An animal experiment and clinical investigations have been done to choose a suitable negative pressure of closed suction drainage of the peritoneal cavity.
在动物实验和临床观察基础上，探讨腹腔负压引流适宜的负压值。
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