单词：spherical joint
spherical joint的用法和样例：
例句
- The toe of the raised hind leg should reach just above the fetlock joint of the other hind leg.后蹄尖抬起的高度应刚好达到另一侧后肢球节的上方。
- Viewed from the side, pasterns are slightly slanted, with the pastern joint strong, but flexible.从侧面看，球节略微倾斜，坚固，但是是灵活的。
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