Como dizer "Uma série de coisas" em inglês

A series of things
A plethora of things

Examples:

- There is a plethora of things that need to be considered.

- But if there are two things Afghanistan has a plethora of, it's those two things. I chose to propose something different, which thrilled them all.
The New York Times

- Water-level Regulator for a Series of High-temperature Water Baths. (Headline)
Sciencemag.org