When it's spinning parallel to the ground, support your weight on your left foot and use your right foot to power your spin; the momentum of the hoop should carry you around.
首先从前位站姿开始；让呼啦圈逆时针转起来，当旋转和地面平行的时候，把重心放到左脚上，用你的右脚来给力；呼啦圈的动力会带动你晃动。
So by parallel we mean - they're either both spin up remember that's our spin quantum number, that fourth quantum number.
所以我们意味着，它们都是自旋向上，记住我们的自旋量子数，是第四个量子数。
Their goal was less to drive foot traffic to Wabash avenue-which runs parallel to the more popular north-south thoroughfares of State Street and Michigan avenue-than to put a fresh spin on public art.
他们的目标是步行到沃巴什大道—南大道北州街与密歇根大道，而不是在公共艺术的一个新的周旋。
The rotating pendulum is a typical underactuated system with a rotating shaft of the motor attached to the end which is free to spin about an axis parallel to the axis of rotation of the pendulum.
旋转摆属于典型的欠驱动系统，通过驱动杆的水平转动可使欠驱动杆由垂直下摆位置转到竖直向上位置。
The results show that: (i) the spin-polarization of electron can not be produced in the anti-parallel magnetic barriers structure at zero bias voltage;
结果表明：零偏压下，电子在反平行等强磁垒结构中输运不会产生自旋极化；
The results show that: (i) the spin-polarization of electron can not be produced in the anti-parallel magnetic barriers structure at zero bias voltage;
结果表明：零偏压下，电子在反平行等强磁垒结构中输运不会产生自旋极化；
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