上午10时出发的英文：
departure at 10 a.m.

We departed for London at 10 a.m.
我们于上午10时出发前往伦敦。

The cold weather antedated their departure.
寒冷的天气使他们提前离开。

We apologise for the late departure of this flight.
本航班延误离境，谨致歉意。

His sudden departure was a disadvantage to the campaign.
他的突然离去对竞选造成不利影响。

So the archdeacon and the precentor took their departure
这样，会吏长和圣诗班领唱人便起身告辞。

You have to be there half an hour before departure time.
你要在飞机起飞前半小时到达那里。