The time in the early morning when the sun comes up — the same moment as sunrise. The two words mean the same thing, so the real question is which one to use, and that is a question of feeling rather than meaning.

The time in the early morning清晨的那個時刻 when the sun comes up太陽升起的時候 the same moment as sunrise跟 sunrise（日出）是同一個時刻。The two words這兩個字 mean the same thing意思一樣 so所以 the real question真正的問題 is which one to use是要用哪一個 and而 that這 is a question of feeling rather than meaning是語感的問題，不是意思的問題。

'Sunrise' can be the beautiful sight — the colours in the sky, the thing you take a photograph of. 'Sun-up' almost never is.

「sunrise」這個字 can be可以指 the beautiful sight美麗的景色 the colours in the sky天空中的顏色 the thing you take a photograph of你會拍照的東西。「sun-up」 almost never is幾乎從來不是這樣。

Sun-up is a point on the clock, the moment work can begin. That is why it lives mostly inside one phrase: 'from sun-up to sundown' — meaning all day long, and usually all day working hard. Farmers, soldiers, fishermen, builders. If a person says they worked from sun-up to sundown, they are telling you they were tired.

Sun-up Sun-up（也就是天亮） is a point on the clock是時鐘上的一個時間點 the moment work can begin可以開始工作的那一刻。That is why這就是為什麼 it lives mostly inside one phrase它幾乎只活在一個片語裡 'from sun-up to sundown''from sun-up to sundown'（從日出到日落） meaning all day long意思是一整天 and usually all day working hard而且通常是辛苦工作的一整天。Farmers農夫、soldiers軍人、fishermen漁夫、builders建築工人。If a person says如果有人說 they worked from sun-up to sundown他們從日出工作到日落 they are telling you他們是在告訴你 they were tired他們很累。

It has a plain, country, spoken feel, and it is much more common in American English than British. You hear it in old songs, in stories about farm life and the American West, and from older speakers. In a weather report or a science book you would see 'sunrise' instead — nobody writes 'sun-up is at 5:42'.

It has a plain, country, spoken feel它有一種樸素、鄉下、口語的味道 and而且 it is much more common in American English than British在美式英語裡比英式英語常見得多。You hear it你會聽到它 in old songs出現在老歌裡 in stories about farm life and the American West出現在講農場生活和美國西部的故事裡 and from older speakers也出現在年紀較大的人的口中。In a weather report or a science book在氣象報告或科學書裡 you would see 'sunrise' instead你看到的會是'sunrise' nobody writes 'sun-up is at 5:42'沒有人會寫「sun-up is at 5:42」。

The spelling wobbles: sun-up, sunup, and sun up all appear, and none is wrong. Americans often write it closed up as 'sunup'. Its partner word at the other end of the day is 'sundown', which is usually written as one word without a hyphen — a small oddness worth remembering.

The spelling wobbles拼法不太固定：sun-up, sunup, and sun upsun-up、sunup、sun up 三種寫法 all appear都會出現 and none is wrong而且沒有一種是錯的。Americans美國人 often write it closed up as 'sunup'常把它連著寫成「sunup」。Its partner word at the other end of the day它在一天另一端的搭檔字 is 'sundown'是「sundown」 which is usually written as one word without a hyphen通常寫成一個字、沒有連字號 a small oddness worth remembering這是值得記住的一個小怪處。