ball and socket

基本解释

In the diseased hip, the "ball and socket" become irregular, rough, and deformed, causing pain and decreased range of motion (Figure 1).
在髖關節病變的“球窩”變成不槼則，粗拙，變形，導致疼痛和關節活動範圍減小（圖1）。
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放置，將石塊連接起來，然後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，然後將這些直立的石塊和楣石用球窩接頭或楔口接頭來固定。

Seeing exactly how certain joints work was a good refresher for me (remember learning the difference between hinged joints for the elbow, and ball-and-socket, like the hips?), and following the blood flow into and out of the heart always makes me wonder at the fine-tuned machinery of the human body.
FORBES: Google Body lets you explore what's under your skin