随着海拔的增加(高于海平面)，大气压力减小，导致吸入柴油机气缸内的空气量减少。
With the increase of altitude (above sea level), atmospheric pressure decreases, which leads to a reduction of the air amount inhaled into the cylinder of diesel engines.
当管道系统空气压力增加时，SPRD会自动开启，以防止管道系统中空气流动的减少和过度噪音和速度。
The SPRD will automatically open as the air pressure in the duct system increases, in order to prevent the reduction of air flow and excessive noise and velocity through the duct system.
冷暖空气并列排着，大气压力随高度的减少冷空气要比热空气来得快，因为冷空气压缩得更多。
Where warm and cool air lie side by side, atmospheric pressure decreases with height more rapidly in the cool than in the warm air, because the cool air is more compressed.
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