Each time he finished a cigarette, an arm reached out and replaced it, dense puffs of gray smoke following moments later.
每当他抽完一根，都会伸出一只手换一根新的烟上去，把之前的烟灰抖掉，缭绕着一股灰色的烟。
Gray clouds billow through the streets of the financial district and shroud the 16 acres where the towers had stood just moments before.
灰色的烟尘浪涌的通过了金融区街道并且覆盖了16英亩双子塔曾经站立的位置。
The use of moments for image analysis is straightforward if we consider a binary or gray level image segment as a two-dimensional density distribution function.
若把二值图或灰度图看作是二维密度分布函数，就可把矩技术应用于图像分析中。
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