In particular, a force field with no curl is a force field that does not generate any rotation motion.

特别地，一个没有旋度的力场，就是一个不产生任何旋转运动的力场。

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In rotation, force becomes torque, mass becomes moment of inertia, and acceleration becomes angular acceleration.

在旋转时，力变成力矩，质量变成转动惯量，加速度变成角加速度。

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And if the curl is zero then it means that this force does not generate any rotation effects.

如果旋度是0，就意味着，这个力不产生旋转作用。

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The PARC group first considered putting the cells on a rotating platform like a CD-ROM but nixed that because centrifugal force in rotation might pull the cells off the platter.

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The great rotation everyone was looking for in late 2012 continued in January, and in full force with retail investors jumping into exchange traded funds and mutual funds.

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This constant rotation will mean that troops from many countries will have to meet the stringent standards set for the new force.

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