及物动词
不及物动词
名词
1. （门等的）铰链，合页
A hinge is a piece of metal, wood, or plastic that is used to join a door to its frame or to join two things together so that one of them can swing freely.
相关词组：hinge on
1. a joint that holds two parts together so that one can swing relative to the other
Synonym: flexible joint
2. a circumstance upon which subsequent events depend
e.g. his absence is the hinge of our plan