检举员必须接受数小时的培训，才能掌握以“哈特·里奇烟度单位”(Hartridge unit)计算的“烟浓度”之类的概念。

Spotters must take hours of training to master such concepts as smoke density, measured in 'Hartridge units.

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驱熊喷雾器尽管只含有2%的辣椒素(capsaicin)，但广告宣称其辣度为330万单位；而可以引发剧痛的纯辣椒素其辣度骤升至1600万。

Two percent capsaicin bear spray is advertised at 3.3 million units, and pure capsaicin - the chemical that causes the pain - hits 16 million.

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只需记录输出电压并执行一些简单的计算，就能找到以摄氏度或华氏度为单位的温度。

Record the output voltage and perform some simple arithmetic to find the temperature in degrees Celsius or Fahrenheit according to preference.

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And so redefining then the temperature scale to the Kelvin scale, where t in degrees Kelvin is equal to t in degree Celsius, plus 273.15.

以K为单位的温度,是以℃为单位的温度,加上273。15度。

麻省理工公开课 - 热力学与动力学课程节选