It is after all a simple ball and socket joint; it has certain loads imposed on it; it needs reliability over a defined life; it must contain materials suitable for the working environment.

它毕竟是一个简单的球窝关节；它有一定的载荷；它在有限的生命中需要可靠性；它必须包含适合工作环境的材料。

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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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He then tested how much friction there was when a ceramic ball and a polyethylene socket were immersed in a liquid with the same properties as synovial fluid.

BBC: Longer-lasting hip-joint hope

It turned out that the handle had compressed the eyeball in and pushed it up in the socket (think about squeezing a rubber ball), but it remained attached.

CNN: Man's eye saved after impalement