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.
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。
3
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.