空换，属于期货术语，意思就是空头换手。空换的规范叫法是：空换手。
真空换档 vacuum gearshift
真空换挡 vacuum power shift ; vacuum pump power shift
空换位 void transposition
重空换车装置 Car-passer
交换空间 [计] swap space ; swap ; Paging Space ; Trading Spaces
空气换向阀 air reversing valve ; air reersing ale
空分交换 Space Division Switching
空气交换 fresh air exchange ; interchange of air ; air inerchange ; Air exchange
空间转换 spatial switching ; space-shifting ; space shift
如果这里有一个空位并且升级名单是空的呢？这意味着乘客可以换舱了吗？
If there is an empty seat and the upgrade list is empty, does that mean passengers from another section can relocate?
初始换热温差ITD值的优化是直接空冷电站设计过程中较为关键的部分，关系到整个电站设计是否经济、合理。
The optimization of Initial Temperature Difference (ITD) is the relatively key part in the process of the design of the direct air cooling power station.
针对某中板厂提供的轧制工艺参数及目标控制参数，通过研究钢板水冷及空冷过程的换热规律，利用差分方程建立了中厚板双机架间的冷却模型。
Through the research of heat transfer regularity in plates water cooling and air cooling process, the cooling model of medium plate double rolling mills is established by using difference equation.
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