后方环枢间距又称脊髓可用空间常常被用来作为诊断的标准。
A criteria often used to make the diagnosis is the Posterior AtlantoDens Interval (PADI) also known as the Space Available for Cord (SAC).
土星可算是太阳系中较为奇特的一颗行星,在望远镜中看来,它的外表犹如一顶草帽,在圆球形的星体周围有一圈很宽的“帽沿”,这就是土星光环,又称土星环。
In 1610, the year after Galileo first turned a telescope to the sky; he became the very first person to observe Saturn's rings, though he could not see them well enough to discern their true nature.
土星可算是太阳系中较为奇特的一颗行星,在望远镜中看来,它的外表犹如一顶草帽,在圆球形的星体周围有一圈很宽的“帽沿”,这就是土星光环,又称土星环。
In 1610, the year after Galileo first turned a telescope to the sky; he became the very first person to observe Saturn's rings, though he could not see them well enough to discern their true nature.
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