在调整文本大小时，假设图像的大小是基本行距倍数。
When text sizing, assume that the size of an image should be a multiple of the basic leading.
要计算出基本行距所需的行高和18px的空白，执行下面的计算。
To calculate the desired line height and margin of 18px for the basic leading I do this.
要计算出基本行距所需的行高和18px的空白，执行下面的计算。
To calculate the desired line height and margin of 18px for the basic leading I do this.
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