Proportional Spacing Machine font比例间隔机器字型
proportional spacing mechanism比例间隔机构
fixed and proportional spacing固定和成比例字符间隔
text spacing proportional间隔相称的正文
N（名词） a feature of some typewriters and other output devices whereby the space allotted to each character is determined by the width of the character 比例间距; 均匀间距