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A nit is really a measurement of the light that a Screen emits, equal to one candela for every sq. meter. Brighter shows be certain a screen's contents are easy to examine, even in sunny conditions.这是支持的最大下载速度。实际的下载速度通常会更低，因为其会受到其他因素（如：家�?移动网络速度）的影响