The flashcard defines 'luminosity' as a noun meaning 'the state of being luminous' or 'brightness'.
luminosity 是一个名词，意思是“发光”、“发亮”；“光度”或“亮度”。
| Front | luminosity [lumin;-osity n.] |
|---|---|
| Back | n.发光，发亮； 光度，亮度 |
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