侧轴尺寸属性则是在侧轴方向上的长或者宽属性。
The cross size property is whichever of width or height that is in the cross dimension.
和主轴垂直的轴叫做侧轴，它在侧轴方向上延伸。
The axis perpendicular to the main axis is called the cross axis. It extends in the cross dimension.
伸缩项目在侧轴方向上的长或者宽是它的侧轴尺寸。
The width or height of a flex item, whichever is in the cross dimension, is the item's cross size.
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