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。
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。
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。
Boom crane often has a boom with varying cross section. Boom weight, its construction and main dimension significantly affects the crane performance.
臂架式起重机常采用变截面的臂架，臂架的自重、结构型式与主要尺寸对起重机的性能有重要的影响。
Boom crane often has a boom with varying cross section. Boom weight, its construction and main dimension significantly affects the crane performance.
臂架式起重机常采用变截面的臂架，臂架的自重、结构型式与主要尺寸对起重机的性能有重要的影响。
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