遗憾的是，一秒钟的标准定义依赖于原子在绝对零度的条件，而实际的时钟需要在室温下运行，室温条件下电子壳层膨胀了。
Unfortunately, the standard definition of a second relies on what the atom does at a temperature of absolute zero. Real clocks need to run at room temperature, where the shell of electrons puffs up.
在室温和压强(常压)下，装满氢的75升(大约20加仑)标准燃料箱只能驱动一辆氢动力汽车行使大约1公里。
Filling a typical fuel tank of 75 litres-about 20 American gallons-with hydrogen at room temperature and pressure will take a hydrogen-powered car only about a kilometre or so.
冷镦钢是一种在室温条件下，利用金属塑性成型工艺，生产互换性较高的标准件用钢。
Cold forge steel is a kind of special use of steel which can be used to produce the standard part in the room temperature.
改变标准养护箱和标准养护室温湿度控制仪探头的位置，可有效地控制标准养护箱和标准养护室中的湿度。
Change the location of detecting head of humidity control gauge in standard curing box and standard curing room so as to efficiently control humidity of standard curing box and standard curing room.
改变标准养护箱和标准养护室温湿度控制仪探头的位置，可有效地控制标准养护箱和标准养护室中的湿度。
Change the location of detecting head of humidity control gauge in standard curing box and standard curing room so as to efficiently control humidity of standard curing box and standard curing room.
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