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。
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.
当「建立真空」 （正常操作下）时，空气入口处的不可凝结物和蒸汽中的氧含量以及凝结水必须由主抽汽器排出。
When " holding " ( during normal operation ), non condensable, which are coming from air ingress and oxygen content in steam and condensate, must also be extracted normally by main ejectors.
阐述了水泥中不可忽视的一项重要技术指标- 凝结时间。
The paper elucidates that for cement an important technical index-setting time, which must not be neglected.
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