... drawbar ball and socket 牵引杆球头和球座 ball and socket structure 关节构造 ball bearing socket 滚珠轴承套 ...
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Figure 12 shows a few of the changes with respect to Structure diagrams, namely the ports, parts and the ball and socket notation.
图12显示了结构图的变化，即端口、部件与ball和socket符号。
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