mornings
The morning is the part of each day between the time that people usually wake up and 12 o'clock noon or lunchtime.
During the morning your guide will take you around the city.
上午导游会带你们在城里逛逛。
On Sunday morning Bill was woken by the telephone.
周日早晨,比尔被电话吵醒了。
If you refer to a particular time in the morning, you mean a time between 12 o'clock midnight and 12 o'clock noon.
I often stayed up until two or three in the morning.
我经常熬夜到凌晨两三点钟。
in the morning
If you say that something will happen in the morning, you mean that it will happen during the morning of the following day.
I'll fly it to St Louis in the morning.
我会在明天上午把它空运到圣路易斯。
morning, noon and night
If you say that something happens morning, noon and night, you mean that it happens all the time.
You get fit by playing the game, day in, day out, morning, noon and night.
坚持每天从早到晚做这项运动,日复一日,你就会变得健壮起来。