评论了机床主轴转轴的两种不同定义，其一是CIRP统一文件的回转轴线定义，另一是瞬时回转中心线的定义，指出这两种定义均有不妥之处。

The two different definitions of the axis of rotation are discussed. One is the definition of the CIRP text and the other is that of the instantaneous center of rotation.

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营口市体育中心拟建在营口市黄海大街与市府路交汇处西，位于营口中心城区主轴线上。

Yingkou Olympic Sport Center is planned to construct to the west of the node of Huanghai Street and Shifu Road in Yingkou and is located on the major axis of the city core of Yingkou.

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这个项目与城市南边主轴线中心的大教堂相对。

The project is situated opposite the cathedral at the heart of several major axes on the south side of the city.

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