How many different ways can we color a roulette wheel of 15 locations with the three colors red, blue, and green ? 用红、蓝和绿三种颜色给有15个方位的转盘着色，有多少种方式？
Strains require special treatments for removal such as exposure to high concentrations of liquid detergents . 要清除这些着色物质，需要特殊处理，例如，浸溃在高浓度的洗涤剂溶液中。
The slightly porous nature of the surface of the oxide film allows it to be coloured with either organic or inorganic dye . 氧化膜表面具有轻微的渗透性，因而可以用有机或无机染料着色。
Dye-penetrant and magneticparticle inspection techniques were used on the repaired and other 21 remaining original welds . 在已修补了的和其余21个原来的焊缝上进行了着色渗透和磁粉探伤工艺处理。
The cells from a normal female contain a small darkly staining body lying just within the nuclear membrane--this is the barr body . 正常女性的细胞含有一个深着色的小体，它位于核膜中这就是巴氏小体。
This reduction also enables us to obtain some information about the number of colourings of a graph with a given set of colours . 这种化法也能使我们得到关于用给定的颜色集对一个图的着色的数目的某些信息。
The high colour value or absorptivity needed for a commercial dye is not an advantage when that dye ends up in a waste stream . 当它排入废水时，作为商品染料所必须具备的强着色值成的附性显然对废水处理不利。
The children, in their bright hoods and comforters, never walked, but always ran from the moment they left their door . 孩子们戴着色彩鲜艳的风兜帽和羊毛围巾，从来不是在走，从离开大门的那一刻起就一直在奔跑。
The coloring material results from contact of the water with organic debris, such as leaves, needles of conifers and wood, an in various stage of decomposition . 着色物质是由水与有机残渣，如树叶、针叶树的针叶和木材，以及所有这些物质在各个阶段的分解产物相接触而产生的。
The coloring method to negate hamilton properties of a graph 问题的着色否定方法
