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.
双语例句
例：
The top swung open on well-oiled hinges.
合页润滑得很好，盖子一下子就开了。
PHRASAL VERB. 短语动词
hinges , hinging , hinged
hinge on
1.?[PHRASAL 短语] 完全取决于
Something that hinges on one thing or event depends entirely on it.
双语例句
例：
The plan hinges on a deal being struck with a new company.