B1 [ U ] US also sunup the time in the morning when the sun starts to rise in the sky日出(时分),拂晓,黎明
They went out at sunrise to go bird-watching.他们日出的时候就出去观鸟去了。
We have to leave before sunup tomorrow.我们明天得在日出之前离开。
B1 [ C ] the appearance of the sky when the sun starts to rise晨曦,朝霞
There was a beautiful sunrise this morning.今天早上的朝霞很美。