1）快递：the act of bringing goods, letters etc to a particular person or place, or the things that are brought

举个例子：

You can expect your delivery in 2 to 3 days.

你可以在2到3天内收到货物。

给我们送快递的小哥哥/小姐姐你也可以说是：delivery guy/ girl

2）生孩子：the process of giving birth to a child

举个例子：

Mrs Li had an easy delivery.

李太太生得很顺利。

产房也可以说成是：delivery room

3）演讲风格：the way in which someone speaks in public

举个例子：

You'll have to work on your delivery.

你还得在演说技巧上下功夫。