英语part和role区别？

两个词的共同点就是都表示”角色“这个意思
play a part in 用在参加某活动时,作为其中的一员,一部分.
play a role in表示扮演某一角色,起某种特定的作用.
part
[pɑ:t]
n.
一部分; 局部
A whole consists of parts,the parts constitute the whole.
整体由部分组成,部分构成整体.
零件
She carried some machine parts from this city to that one.
她将一些机器零件从这个城市运送到那个城市.
角色
Do the actors all know their parts yet?
演员们都熟悉他们的角色吗?
vt.& vi.
(使)分裂成几部分,断裂
The cable suddenly parted.
缆索突然断裂.
(使)分离[开]
The couple parted amicably.
这对夫妻客气地分手了.
role
[rəul]
n.
作用,职责
The success of her business made it difficult for her to fulfil her role as wife and mother.
她在事业上的成功使她难以尽到当妻子和母亲的职责.
角色
She prefers to play comic roles.
她更喜欢扮演滑稽角色.