He often feels frustrated due to his exclusion from team activities.

exclusion 是动词 exclude 的名词形式，由前缀 ex-（表示"向外"）和词根 clude（来自拉丁语 claudere，意为"关闭"）组成，字面意思是"关在外面"。在句中指"被排除在外、不被接纳"的状态。