A flex item's width or height, whichever is in the main dimension, is the item's main size.

伸缩项目在主轴方向上的长或者宽是这个项目的主轴尺寸。

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The flex item's main size property is either the width or height property, whichever is in the main dimension.

一个伸缩项目的主轴属性是在主轴方向上的长或者宽属性。

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The main axis of a flex container is the primary axis along which flex items are laid out. It extends in the main dimension.

主轴是伸缩项目在伸缩容器里分布所遵循的主要轴线，在主轴方向上延伸。

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