To obtain the right float behavior, simply swap the direction (that is, left becomes right).
要获得右浮动行为的相应信息，只需互换方向即可（即，将左换成右）。
We chose to float both containers left and right.
我们选择让两个容器分别向左右浮动。
The upper left float comes first in the source, and the lower right is last.
左上方的浮动在源源代码中先出现，右下方的最后。
The upper left float comes first in the source, and the lower right is last.
左上方的浮动在源源代码中先出现，右下方的最后。
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