社会人用英语可以翻译为 "working adult" 或 "member of society." 这两个词都表示成年人在社会中的角色。

"Working adult" 的来源可以追溯到英语中的动词 "to work," 表示工作的意思，而 "adult" 来自拉丁语中的 "adultus," 意思是成熟的、完全发育的。所以 "working adult" 就表示成年人在工作中的角色。

"Member of society" 的来源也来自英语中的名词 "society," 意思是人类社会，而 "member" 来自拉丁语中的 "membrum," 意思是部分、成员。所以 "member of society" 就表示成年人在人类社会中的角色。

下面是一些例句：

- She is a working adult who enjoys her job as an accountant.

- He is a member of society who is involved in many social organizations.

- They are working adults who support their families and contribute to their communities.

- We are members of society who are responsible for our own actions and the welfare of others.