ball and socket joint

基本解釋

Ball and socket joint at shoulder allows movement in 3 planes.
球窩關(guān)節(jié)―在肩膊容許三平面的運(yùn)動。
They made joints in stone keeping the lintels in place horizontally using a tongue and groove joint and subsequently fixing the upright and lintel with a ball and socket joint or mortice and tenon.
石匠們用楔口連接法將楣石水準(zhǔn)放置，將石塊連接起來，然后將這些直立的石塊和楣石用球窩接頭或楔口接頭來固定。
They made joints in stone keeping the lintels in place horizontally using a tongue and groove joint and subsequently fixing the upright and lintel with a ball and socket joint or mortice and tenon .
石匠們用楔口連接法將楣石水平放置，將石塊連接起來，然后將這些直立的石塊和楣石用球窩接頭或楔口接頭來固定。