字行长度(行宽)：每栏字的阔度。亦称行宽。
Line length: The width of a line of type, or column, or page. Also called Measure.
常用物料有铜、沥青、塑料、橡胶混合而成，和投标指定的厚度和阔度。
Materials commonly used include copper, asphalt, plastic, rubber, composition, and combinations of these materials, Bid the gauge of thickness and width specified.
字宽被分为很多份，每份为一单位，以便按比例分配给不同阔度的罗马字符。
The set is divided into units so that Roman characters fake up the space proportionally.
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