The escapement vector is parallel to the base line of a row of text. 行距向量與文本行的基線平行。
Word line spacing should be greater than the spacing between characters, otherwise the viewer's gaze is hard to follow the direction and the reading order. 字的行距答大於字的間距，否則觀眾的視線難以按必定的標的綱的和挨次舉行瀏覽。
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