a chip on one's shoulder，不能译成某人肩

a chip on shoulder 不能译成“某人肩膀上的木屑或芯片”，它是一个习惯用语，可以意为“根深蒂固的不满，耿耿于怀，怀恨在心”等，尤指对某事，是一种非正式的表达方式，寓意：

holding a grudge or grievance

怀有怨恨或不满

a perceived sense of inferiority

自卑感

being angry because of something that happened in the past

因为过去发生的事情而生气

habitually combative attitude

习惯性好斗的态度

take offence easily

容易生气

例如：

He's always picking up fights with everyone. He seems to have a chip on his shoulder.

他总是找人打架。他好像对什么不满。

解析：seem to do sth 意为“似乎或好像要做某事”，侧重指根据某种迹象作出的推断。

He has a chip on his shoulder for not being born into a rich family.

因为不是出身于富裕家庭，他耿耿于怀。

She still seems to have a chip on her shoulder about the argument she had with her friend last week.

她似乎对上周和她朋友的争吵仍耿耿于怀。

解析：定语从句 she had with her friend last week 修饰先行词 the argument，此处省略关系代词 that 或 which，因为它们在从句中作宾语，通常可以省略。

He has a chip on his shoulder for not being invited to the party.

他因没有被邀请参加聚会而怀恨在心。

Why do you get so aggressive at the slightest hint of criticism? You seem to have a chip on your shoulder.

你为什么一听到批评就这么咄咄逼人？你好像对什么不满。