也就是在什么方向上，函数值不变化呢？

So, in which direction does the function not change?

youdao

松质骨孔隙率在垂直于轴向的方向基本不变。

The cancellous bone porosity basically keep constant along the transversal direction.

youdao

你如照直向北走，你的方向是恒久不变的。

If you walk due north, your direction is constant.

youdao

应力场方向在时间和空间上并不是一成不变的。

The orientation of stress field isn't all unchanged in the space and time.

youdao

应力场方向在时间和空间上并不是一成不变的。

The orientation of stress field isn't all unchanged in the space and time.

youdao