轴线，可让物体围绕着作旋转运动的一个想像的直线或实际存在的部件(如轴)。

AXIS, an imaginary straight line or an actual physical component (such as an axle) around which a body can rotate.

youdao

高速离心泵内的三维定常湍流流动计算结果不仅为诱导轮内部流场诊断提供数据，还指出了该泵中存在的部件设计问题。

The calculated results of three-dimensional steady flow not only offer the based dataset for flow diagnoses in the pump, but also indicate the design problem in some parts of the pump as well.

youdao

万物都是由之前存在的，部件组成之后才出现的。

Things come into being by being composed of previously existing parts.

youdao

And then, when those things cease to have the form they had, the parts get used for other purposes.

当物体不再以它们之前的型相存在之后,每个组成它的部件会有其他的用途

耶鲁公开课 - 死亡课程节选

The things that make me up existed before, and will continue to exist after my death.

那些构成我的部件在我之前就存在,并且在我死后依然存在

耶鲁公开课 - 死亡课程节选

But that doesn't mean that every part of my body existed before I was born, and that every part of my body will continue to exist after I die.

但是这并不意味着,组成我身体的所有部件都是先于我的存在,并不是每一个部件,都会在我死后依然存在

耶鲁公开课 - 死亡课程节选