You can even Angle your flash up and behind you to fill a small to normal-size room up with beautiful light. Spin it around and up at about 45 degrees to hit the wall and ceiling behind you.
Others, such as the comic notion that space travelers would suddenly start to spin clockwise during normal motion in space, have not.
其他一些预测，如宇航员在太空中正常活动时会突然按顺时针方向旋转这样令人可笑的想法至今未得到证实。
3
In the normal region, the incontrovertible definition is used to calculate the persistent spin current, and the calculation formula is also discretized.