1
at sunup
表示具体的时间点。
We start work at sunup.
我们在日出时开始工作。
日出；黎明
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日出；黎明
the first light of day
We start work at sunup.
我们在日出时开始工作。
黎明；天亮
the first light of day
We woke up before sunup to catch the early train.
我们在日出前起床去赶早班火车。
The farmers start working at sunup every day.
农民们每天日出时开始干活。
She likes to watch the sky change color at sunup.
她喜欢在日出时看天空变色。
表示具体的时间点。
We start work at sunup.
我们在日出时开始工作。
表示时间先后。
The rooster crows before sunup.
公鸡在日出前打鸣。
用作主语，描述日出时间。
Sunup is around 6 a.m. in summer.
夏天日出大约在早上6点。
Not this
We sunup at 6 AM.
Use this
We wake up at sunup.
Sunup 是名词，不能作动词。应使用 'at sunup' 表示时间。
Not this
We left in the sunup.
Use this
We left at sunup.
Sunup 前常用介词 at，表示某个时刻，而不是 in。
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Dictionary facts from ECDICT, WIKTIONARY.