旋转对称(或称放射对称)是指某一物体绕着某一点在某一方向上做转动。
Rotational symmetry (or radial symmetry) is when an object is rotated in a certain direction around a point.
用手轻轻转动，使盖子沿箭头? 方向快速旋转。
Rotate the cap with your hand lightly in the direction as indicated by the arrow.
转动旋扭（如图）开机，可以根据需要调节旋扭可以控制摄像头灯的亮度，朝反方向朝反方向旋转可关闭电源；
Turn the knob to turn on the unit as the above diagram. You can adjust the brightness of the Camera lights by turn this knob too. Turn the knob at the opposite direction; you can turn off the unit.
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