将光标放在第一行第二个单元格中(右上)。
Place the cursor in the second cell of the first row (upper right).
在第一行,第二个参数的用处可能不是很明显。
In the first line, it may not be obvious what the second, argument is for.
这一行中第一个“400”,是指文件夹的宽度(以像素为单位),第二个“400”是指文件夹的高度。
The first "400" in this line is the folder width in pixels, the second is the folder height.
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