1、The clouds which filled the sky at break of day have disappeared.
破曉時(shí)滿(mǎn)天的云已經(jīng)消失了。

2、At break of day the hikers were already on the trail
黎明時(shí)分，那些徒步旅行者已經(jīng)上路。

3、They walked the whole night long, and by break of day came once more to their father's house.
他們走了整整一夜，天剛亮?xí)r又回到了父親的家。