The permutation is even if the number of inversions it contains is even.
如果一个排列中含有的反序的个数是偶数，则称它为偶排列。
When done correctly, inversions also release tension in the neck and the spine.
当倒立姿势正确时，也可以释放颈部与脊柱的紧张。
When done correctly, inversions also release tension in the neck and the spine.
当倒立姿势正确时，也可以释放颈部与脊柱的紧张。
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