纯数，普通数学被称为“纯数”。流体力学中某些物理量的量纲可以简化为1，称这样的物理量为无量纲量，也称纯数
依数现象是这样一种现象,当你把物质混合在一起的时候,你不会得到纯物质,而是得到混合物质。
Colligative properties are the properties like the vapor pressure, lowering when you have a mixture in a liquid, instead of having a pure substance you have amixture of substances here.
这可能部分源于分离寡聚物成本高耗时长——从数百公斤干燥的植物样本中可能只能分离得到数毫克的纯品。
This is partly because isolating the oligomers is both costly and time-consuming - processing hundreds of kilograms of dried plant material often yields only a few milligrams of a single product.
城市属于某一国家的某一地区，城市信息包括(纯ascii)名称、带重音符的名称(可能包含外文字符)、人口数(如果人口数未知，就是0)、纬度和经度。
Cities are within a region of a country and have a (pure ASCII) name, an accented name (which might include foreign characters), a population (or 0, if unknown), a latitude, and a longitude.
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