The knob (1) has a cylindrical base with a center axis, where the knob is rotatable around the center axis.

所述手柄(1)具有柱状的基体，并且能够绕着柱状的基体的中心轴线旋转。

youdao

The rotating system could be designed to realize work pieces only rotate along the center axis according to customer's requirement.

根据客户需要，旋转系统可设计为仅实现工件沿中心轴做圆周公转。

youdao

The center axis of the part has inclusion defects as well as porosity and thus is suitable only for parts where this can be machined away.

零件的中心轴附近存在缺陷和孔隙，因此仅适用于能将这些机加工去除的零件。

youdao

Then, while continuing to support Megawati's presidential bid, he became the standard-bearer for what was dubbed the Center Axis, a loose alliance of Muslim parties.

CNN: Maneuvering to the Top amid Chaos

Another common reply is (3) climb atop the blades and position your center of gravity over the axis.

WSJ: How to Ace a Google Interview

Displaced slightly to right so vertical axis aligns with the center of big date display.

FORBES: The Face of Time