[guān jié]
[生理] （骨头连接处） joint; articulation; articulus; juncture; arthrosis; article; artus; knuckle
finger joint
手指关节
A joint has started.
一个关节脱臼了。
The man is getting old and his joints are stiff.
人老了，关节也硬化了。
（起关键作用的环节） key links; links
Attention should be centred on the links that have a bearing on the situation as a whole.
应该注意那些涉及全局的重要关节。