This engagement might take the form. of arrest, dispersal or destruction, depending on the situation, but the key is to build a tactical system of attack that avoids assault.

这种战斗可能是以逮捕，驱散或者破坏的形式进行，依赖于当时的情形，但关键是建立一套避免强攻的战术攻击系统。

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Any form of positive-pressure ventilation is deleterious during cardiac arrest because the increase in intrathoracic pressure decreases venous return to the heart and perfusion of the heart and brain.

因为正压通气会提高胸内压，减少静脉回流，进而减少心脑血液灌注。

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Any form of positive-pressure ventilation is deleterious during cardiac arrest because the increase in intrathoracic pressure decreases venous return to the heart and perfusion of the heart and brain.

因为正压通气会提高胸内压，减少静脉回流，进而减少心脑血液灌注。

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