The single quotes are used because the double quotes are needed within the drawing command if more than one word is to be drawn, and you cannot have double quotes within double quotes.
使用单引号是因为如果需要绘制多个字，则绘图命令中需要使用双引号，而您不能在双引号中再用双引号。
The single quotes are used because the double quotes are needed within the drawing command if more than one word is to be drawn, and you cannot have double quotes within double quotes.
使用单引号是因为如果需要绘制多个字，则绘图命令中需要使用双引号，而您不能在双引号中再用双引号。
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