1. strep throat

链球菌感染的咽喉

2. supersede

If something supersedes something newer, it is replaced because it has become old-fashion or unacceptable.

e.g. Hand tools are relics of the past that have now been superseded by the machine.

3. presumption 

A presumption is something that is accepted as true but is not certain to be true.

e.g. I am having to make a lot of presumption since I don't really know anything about the case.