Etendue
集光率
🗣️ 情景例句
Life is full of ups and downs.
生活充满起伏。
I'm not accustomed to that kind of social situation.
我不太习惯那种社交场合。
No one could account for the fact that one of the boxes was extremely heavy.
其中有只箱子特别重，可谁也弄不清是怎么回事。