钻石的美丽度，取决于钻石它反射与穿透光的方式，更专业的说法就是钻石的光效应（Light Performance）。钻石的光效应指的是钻石的Brilliance亮度（白色光），Fire火彩（彩色光）和Sparkle闪光（闪烁度）。
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sound and light performance 声光表演
Light Music Performance 轻音乐演奏
PERFORMANCE STANDARDS FOR LIGHT-EMITTING PRODUCTS 发光产品的性能标准
The camera, which claims superior image stability and low-light performance, generally did very well for me. But it sometimes had a tendency to take over-bright shots.
号称具有超级稳定成像能力和低光条件拍照性能的摄像头在我的测试中总体表现相当不错，但是有时它拍的照片有点曝光过度。
Do I need particularly high low light performance?
我需要在特别暗的条件下使用吗？
A stray radiation calculation method based on the feature of the R-C system is given for estimating stray light performance in the well-baffled R-C system.
同时，依据R - C系统的特点，提出其杂散辐射的计算方法，用以估计遮光完善R - C系统的杂光水平。
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