Upper是什么意思？

As such, different populations of killer whales have had to learn different hunting techniques in order to gain the upper hand over their local prey.

In terms of class, digital divide exists among different types of workers and between the upper and middle classes and the lower class.

Mail that was already processed in New Orleans facilities was moved to an upper floor so it would be protected from water damage.

Now known as "New York's shared space for art and play," the island, which lies between Manhattan and Brooklyn in Upper New York Bay, is closed to cars but open to summer tourists who flock for festivals, picnics, adventures, as well as these "legal graff

Making sure to obtain an upper-second class degree.

An upper-second class degree, from an elite university.