1
the radiancy of something
The radiancy of the sunrise filled the sky.
日出的光辉充满了天空。
辐射；光辉；光彩
先理解核心含义，再看它在真实句子里的用法。
辐射；光辉；光彩
the quality of being bright and sending out rays of light
The radiancy of the sunrise filled the sky.
日出的光辉充满了天空。
辐射的性质；光辉。
The property of being radiant; radiance
发射的能量量,辐射通量。
The amount of energy emitted, flux.
The radiancy of the morning sun filled the valley with warmth and light.
早晨太阳的光辉使山谷充满了温暖和光明。
The diamond's radiancy captivated everyone at the exhibition.
钻石的光彩吸引了展览上的每个人。
Her smile had a radiancy that could brighten the darkest room.
她的微笑有一种光彩，能照亮最黑暗的房间。
The radiancy of the sunrise filled the sky.
日出的光辉充满了天空。
The stars shone with radiancy.
星星闪耀着光辉。
Her eyes were full of radiancy.
她的眼睛充满了光彩。
Not this
She has a radiancy personality.
Use this
She has a radiant personality.
radiancy 是名词，意为‘光辉、辐射率’，不能直接修饰名词。表示‘光彩照人的’应使用形容词 radiant。
Not this
The radiancy from the nuclear plant is dangerous.
Use this
The radiation from the nuclear plant is dangerous.
radiancy 指‘光辉、光彩’或物理中的‘辐射率’，不表示有害的核辐射。表示核辐射应使用名词 radiation。
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Dictionary facts from ECDICT, WIKTIONARY.