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The steam pressure or water pressure drop.
蒸汽压力或给水压力下降。
The vapour cone effect is caused by pressure differences around the aircraft. A sudden drop in pressure associated with high speed allows water vapour, which is normally invisible, to condense as fog.
蒸汽锥效应是由于战斗机周围的压力差所导致的，高速飞行时压力的陡然降低会使不可见的水蒸气凝结成雾气。
They base this on the previously unconsidered drop in pressure that occurs when water passes from gas to liquid state in condensation.
这是根据先前当水因冷凝由气态变为液态时，气压骤降而得出的。
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