名詞 brightness:

1. the location of a visual perception along a continuum from black to white
2. intelligence as manifested in being quick and witty
   同義詞：cleverness, smartness
3. the quality of being luminous; emitting or reflecting light
   同義詞：luminosity, brightness level, luminance, luminousness, light

1. The act or an instance of gradually diminishing in brightness, loudness, or strength until actual disappearance occurs.
   逐漸消失在亮度、響度或精力上逐漸減弱直至全部消失的活動或例子
2. A unit of retinal illumination, equal to the amount of light that reaches the retina through 1 square millimeter of pupil area from a surface having a brightness of 1 candela per square meter.
   光度視網(wǎng)膜亮度單位，相當(dāng)于每平方米有一燭光亮度的表面，通過一平方毫米的瞳孔區(qū)域，到達(dá)視網(wǎng)膜的光線數(shù)量
3. Stars vary in brightness.
   星星光亮度不同。
4. The light hurt my eyes with its brightness.
   明亮的燈光刺痛了我的眼睛。

bright.ness

n.（名詞）
The state or quality of being bright.
明亮，光輝：處于明亮的狀態(tài)或性質(zhì)
The effect or sensation by means of which an observer is able to distinguish differences in luminance.
敏銳：觀察者賴以能夠分辨不同光度的效應(yīng)或感覺
Color The dimension of a color that represents its similarity to one of a series of achromatic colors ranging from very dim (dark) to very bright (dazzling).
【色彩】 亮度：一種顏色的范圍，表示它與一系列從很昏暗（黑）到很明亮（耀眼）的無色彩的顏色之間的相似處