And, if you take a vector field where maybe everything is rotating, a flow that's just rotating about some axis, then you'll find that its divergence is zero.

如果取一个有旋的向量场，流体流动方向是环绕某个坐标轴的，那么就会发现它的散度是零。

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When an electric field is applied to the electrodes the piezoelectric material translates this into a mechanical strain along its radial axis, causing it to vibrate.

当两个电极之间形成电场时，压电性物质便将电场转化为沿径向轴的机械压力，使纤维震动。

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When the visitors type in the data their eyes are fixed across the vertical axis at the left to the input field.

当用户输入数据的时候，他们的眼睛固定在纵轴输入框左侧的交叉点上。

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In particular, every electron has its own magnetic field aligned with the axis of its spin.

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The reaction would also be carried out in a differently shaped apparatus not a torus, but a cylinder with a magnetic field running along its axis.

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The Geomagnetic pole is the north end of the axis of the geomagnetic field which surrounds the Earth and extends into space as the magnetosphere.

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