But, this advantage also makes the shoulder an easy joint to dislocate. 但是，这个优势也使肩关节成为容易脱位的关节。
The most common type of joint in the human body is the diarthrodial joint -- knuckles and shoulders are examples -- in which two bones come together in a capsule. 人体中最常见的关节是运动关节，如指关节和肩关节等，关节处的一个囊状物把两根骨头结合在一起。
