Empty character strings are a simple way to ensure that text strings and formulae are left-aligned. They are defined using double inverted commas &quot; &quot; . Make sure you do not use any typographic inverted commas. Example:
空字符串是确保文字和公式左对齐的简单方法，可使用双反向逗号 &quot; &quot; 进行定义。请确保未使用任何印刷上的反向逗号。示例：