The amount of sky that you can view through a telescope is called the real (true) field of view and is measured in degrees of arc (angular field).

通过望远镜你所能看到的天空的范围称作真实视场，以弧度值(角视场)来度量。

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And the curl of a force field tells you how quickly the angular velocity is going to increase or decrease. OK.

力场的旋度告诉你，角速度增加或减小的快慢。

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This quick rotation powered a strong magnetic field, which heated the sun’s atmosphere and carried away mass and angular momentum in a strong solar wind of charged particles.

这个磁场加热了太阳的大气层并且带走了由带电粒子（charged particle）组成的强大太阳风的质量（mass）和角动量（angularmomentum）。

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They also calculated impact dose injury risk parameters common to laboratory and on-field traumatic neuromechanics: linear acceleration, angular acceleration, angular velocity, Gadd Severity Index, diffuse axonal injury, acute subdural hematoma, and brain contusion.

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