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