It's much harder, they say, to dislocate a screw than a round-ball-and-socket joint.

这种螺纹状的关节与球状关节相比，更难发生脱臼的情况。

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Ball and socket joint at shoulder allows movement in 3 planes.

球窝关节—在肩膊容许三平面的运动。

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The normal hip is a tightly joined "ball and socket" joint (Figure 1).

正常的髋关节是一个紧密参加“球窝”联合(图1)。

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The normal hip is a tightly joined "ball and socket" joint (Figure 1).

正常的髋关节是一个紧密参加“球窝”联合(图1)。

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