The plane made a dive to a lower altitude.
飞机俯冲到较低高度。
So, the lower bound will be given by the plane.
所以下限是由平面决定的。
Then the plane began to get lower and I got to Xi 'an safely.
然后飞机开始下降，我安全到了西安市。
At higher altitudes air pressure is lower, even though the plane is pressurized.
在较高海拔区域气压较低，尽管飞机已经在加压了。
The air pressure in a plane during flight is lower than at sea level.
飞行中飞机内的气压低于海平面的大气压。
The air pressure in a plane during flight is lower than at sea level.
飞行中飞机内的气压低于海平面的大气压。
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