字符单元宽度 Character Cell Width
字元或表达式宽度 character or expression width
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取得或设定字型中最宽字元的宽度。
Gets or sets the average width of characters in the font.
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两种宽度的字元在单一字串里混和，因此您必须记得检查前导位元组。
Characters of both widths are mixed in a single string; therefore, you must remember to check for lead bytes.
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