Clear colourless amber was considered the best material for rosary beads in the middle ages on account of its smooth silky feel 无瑕疵且无色的琥珀是被视为是制成念珠的最佳材料，因为其光滑如丝般的
A clear water can still have colour if , for example , iron salts are dissolved in it ; but wholesome water should be colorless 清水仍能有颜色，例如，如果把铁盐溶解在水中，水便有颜色，但有益于卫生的水应是无色的。
International experts described cvi as a silent epidemic across the world at the international low vision conference in 2005 外国专家曾在2005年国际低视能会议中指出，脑性视觉障碍已成为一种无声无色的病症，影响全球。
Colorless materials can be used if some means of detecting them is used ( electronic detection , radioactive labeling , or ninhydrin developer ) 如果运用一些其他的检测方法（电子检测，放射性标记，茚三酮等）无色的物质也可以使用。
He suggests child - resistant single - dose packages , caps that require adults to insert a needleless syringe to extract medicine , and colorless syrups 他建议使用防止儿童开启的单剂量包装和瓶盖，糖浆是无色的，使用时需要成年人插入有针头注射器抽取药液。
Although colourless quartz is relatively common , large flawless specimens are not , which is why crystal balls these days are made of glass , not quartz 虽然无色的水晶是极为普遍，但大颗粒且无瑕纯净的却极稀少，这就是为什么当今大部分的水晶球都是玻璃制的。
True enough , millions of years ago , when the gemstones were being created deep inside the core of the earth , chrome was the element which gave the ruby its wonderful colour 百万年前，当宝石仍在地底深处形成时，铬是主要将无色的刚玉转换为红色的红宝石的重要元素。
Leucoplast a colorless plastid , i . e . one not containing chlorophyll or any other pigment . leucoplasts are common in the cells of roots and underground stems and storage organs 白色体：一种无色的质体，不含叶绿素和任何其它色素。白色体多存在于根部细胞、地下茎和储藏器官中。
It is contained within the plasma membrane and comprises a colorless substance ( hyaloplasm ) containing organelles and various inclusions ( e . g . crystals and insoluble food reserves ) 在原生质膜内包含无色的基质（透明质） 、细胞器、还有各种的后含物（晶体，不溶性的储存食物） 。
The gemstones in the corundum group consist of pure aluminium oxide which crystallised into wonderful gemstones a long time ago as a result of pressure and heat at a great depth 蓝宝石的矿物名称为刚玉，其纯铝氧化物，是在久远以前被地层底下的压力和热度结晶化，转换为美丽灿烂的宝石。纯刚玉是无色的。
