The day was dawning when we set out.

发时天刚破晓。

The birds,chirping relentlessly,woke us up at daybreak.

破晓时鸟儿不断吱吱地叫,把吵醒了。

By this time it was daybreak.

这时天已破晓。

Day dawns in the east.

东破晓。

I returned at daylight.

破晓时返回的。