反義詞前綴是im，impublic中文意思是adj,不公開的，非大眾的

例如

The park is now open to the public.那公園現在對公眾開放了。

She retreated from public life.她放棄了社會生活。

Cost management of military industrial research public institution has been a weak point for a long time.長期以來軍工科研事業單位成本管理一直是一個弱項。

其反義詞可以有profit，earn，income，return等等

cost的意思是成本，花費，支出等，其反義詞則為收入，利潤等等

①profit

n. 利潤，盈利；<正式> 利益，好處

②income

n. 收入，收益

③earn

v. 賺得，掙錢；盈（利），生（利）；贏得，博得

④return

n. 回來，返回；歸還，退回；重新開始，恢復；回報，收益；

反義詞: earn

vt. 賺，賺得；獲得，掙得；使得到；博得

You can't expect to earn a living from your painting.

你不能指望靠畫畫來維持生計。

You have to earn their respect before you can win them over.

你要先贏得他們的尊重才能贏得他們的支持。

It's hard to earn a living in this city.

在這個城市裡謀生很難。

To earn the respect of others, you must first respect yourself.

要贏得別人的尊重，你必須首先尊重自己。

How much commission did you earn when you sold the car?

你賣車時賺了多少佣金？

Would you like to become a member and earnpoints?

你想成為會員然後積分嗎？