用on or about造句子，“on or about”造句

Can you enlighten me as to (or on or about) the new procedure?

The first lot under our Sales Confirmation No... will be shipped per S. S."..." scheduled to sail on or about...

fire on or about a weapon system to degrade its performance below what is needed to fulfill its mission objectives.

We would be obliged if you could book one economy class seat for him on a flight leaving Guangzhou on or about July 28.

We can use that to get information about maybe the region or about the average value of a function in that region and so on.