Enter the units of measures directly as text in quotation marks or as a reference. If you enter the units of measure in cells, they must correspond exactly with the following list which is case-sensitive: For example, in order to enter a lower case l (for litre) in a cell, enter the apostrophe ' immediately followed by l.
度量单位可以直接用加引号的文本输入，也可以用引用的方式输入。如果在单元格中输入度量单位，则必须与以下列表保持一致，且区分大小写：例如，要在单元格中输入一个小写字母 l（表示“升”），就需要在输入单引号 ' 后立即输入 l，即输入 'l。