For example, you can try to measure how hard it is to spin this sheet of paper about an axis that is in the center of it.
比如，试着让一张纸绕其中心轴旋转，看看有多困难。
Specifying the following-sibling axis ensures that the style sheet processor checks the element that follows the named anchor.
指定 following-sibling 轴可确保样式表处理器检查紧随命名锚点之后的元素。
Nc sheet metal incremental forming technology is a flexible forming method, it forms the sheet metal layer by layer by a three-axis forming facility.
金属板材数控渐进成形技术，是一种通过三轴数控成形机对金属板材进行逐层辗压而成形工件的柔性加工技术。
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