hinge

n.滑轮，铰链

pivot

A point or circumstance on which subsequent events depend.

A jointed or flexible device that allows the turning or pivoting of a part, such as a door or lid, on a stationary frame.

Synonyms: articulation, axis, ball-and-socket, butt, elbow, hook, joint, juncture, knee, link, pin, spring, swivel, turning point

hilarity, hill, hill-billy, hilliness, hillock, hillside, hilltop, hilly, hilt, him, himself, hind, hinder, Hindi, hindmost, hindquarters, hindrance, hindsight, Hindu, Hinduism, hint, hinterland, hip, hip-bath, hip-flask, hip-pocket, hippie (also hippy), hippo, Hippocratic oath, hippodrome, hippopotamus, hippy, hire, hire-purchase, hireable, hired hand, hireling, hirsute, his, his possess,