Circa means “about” or “around” when we give a date we cannot pin to one exact day or year: circa 1920, circa 300 BCE. In print it is often shortened to c. or ca. (c. 1920).

Circa means "about" or "around"Circa意思是「大約」 when we give a date we cannot pin to one exact day or year當我們講的日期沒辦法確定是哪一天或哪一年時: circa 1920, circa 300 BCE像circa 1920、circa 300 BCE這樣。In print在印刷文字裡 it is often shortened to c. or ca常常縮寫成c.或ca. (c. 1920)（例如c. 1920）

It is a learned borrowing from Latin, so it belongs on museum labels, in history books, catalogues, and careful essays — not in a text about when a friend will arrive. You put it before a year, a decade, or a century. It does not change form, and it does not need of.

It is a learned borrowing from Latin這是從拉丁文借來的書面字 so it belongs on museum labels, in history books, catalogues, and careful essays所以它適合出現在博物館標示、歷史書、目錄和嚴謹的文章裡 — not in a text about when a friend will arrive而不是用在朋友什麼時候會到的簡訊裡。You put it before a year, a decade, or a century你會把它放在年份、年代或世紀前面。It does not change form它不會變化形式 and it does not need of也不需要接of

Though actually, it is not a fancy synonym of about in every sentence. “I’ll be there circa six” sounds stiff, or like a joke pretending to be a historian. Save it for the past when the exact year has been lost, or was never written down.

Though actually不過其實 it is not a fancy synonym of about in every sentence它不是每個句子裡about的高級同義詞。"I'll be there circa six"「我大概circa六點到」 sounds stiff, or like a joke pretending to be a historian聽起來很生硬，或像在裝歷史學家開玩笑。Save it for the past when the exact year has been lost, or was never written down把它留給那種確切年份已經失傳、或從來沒被寫下來的過去

Some very formal lists also put it before a number of objects in an old account, but dates are the use students keep meeting.

Some very formal lists有些非常正式的清單 also put it before a number of objects in an old account也會把它放在舊帳冊裡物品數量前面 but dates are the use students keep meeting但學生會一直遇到的用法還是放在日期前面