当镁与水混合在一起时，它就会产生热量，让水沸腾产生蒸汽，而产生的蒸汽然后就可以驱动涡轮机，而且也可用来做些有用的工作。
When the magnesium is mixed with water, it produces heat, boiling the water to produce steam, which can then drive a turbine and do useful work.
这些材料会吸收高达90%的太阳热量——在新英格兰地区，这点通常都很有用，但在得克萨斯就不那么有用处了。
These materials absorb as much as 90 percent of the sun's heat energy - often useful in New England, but less so in Texas.
某些地区还有用于灌溉计算的相关仪表，而阴凉、热量和成本数据需要因地制宜进行计算。
Related instruments exist for irrigation calculations in certain regions, but shading, thermal, and cost data require site-specific calculations.
对于任何给定的空气部分，更强大的扩展比允许更多的精力从热量转换为有用的机械能，这意味着发动机效率更高。
For any given portion of air, the greater expansion ratio allows more energy to be converted from heat to useful mechanical energy meaning the engine is more efficient.
所谓“被动”是指除基本的建设设备以外，没有用额外的机械设备来加热空气，而且极少使用的电泵或风机散发热量。
The term "passive" means no additional mechanical equipment is used to heat the air, other than the building elements, and that minimal use is made of pumps or fans to distribute heat.
所谓“被动”是指除基本的建设设备以外，没有用额外的机械设备来加热空气，而且极少使用的电泵或风机散发热量。
The term "passive" means no additional mechanical equipment is used to heat the air, other than the building elements, and that minimal use is made of pumps or fans to distribute heat.
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