exposure-time scale
/ɛkspˈəʊʒətˈaɪm ˈskeɪl/
n
English · exposure-time scale中文 · 曝光时间刻度Español · escala de duración de la exposiciónFrançais · échelle des temps d’exposition
意味：Graduated scale that shows the length of time a film should be exposed to light, which is determined by the shutter speed.