你记得马丁·安德森（Martin Anderson）在那本关于联邦推土机的书中，如何描述城市发展效应的吗？
You remember Martin Anderson wrote a book on the federal bulldozer describing the effect of the urban development?
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.
当直升机无法穿越暴风雪，悍马军车在15英尺厚的雪堆中无法动弹时，将会出现一种均衡效应。
When helicopters can't fly through blizzards, and Humvees get stuck in fifteen-foot snowdrifts, there will be an equaliser effect.
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