The relative content of a particular element or constituent (i) within an alloy, usually expressed in weight percent or atompercent.
合金中某一元素或组分的相对含量，通常用质量百分数或原子百分数来表示。
2
Since proteins commonly consist of thousands or tens of thousands of atoms, atom coordinates often represent 90 percent or more of a PDBML document.
由于蛋白质通常是由数千或数万计的原子组成，因此原子坐标通常就能代表PDBML文档的90%甚至更多。
3
Revisiting the atom coordinates in XML format in Listing 2, we find that 94.5 percent of the characters are markup, and only 5.5 percent of the characters are actual values.