I am looking over something before posting it online and I have a sentence that simply doesn't seem to 'sound' right either way I write it. Specifically, I am trying to decide whether it is more correct to use 'oasis' or 'oases' in the sentence below.
There are two types of [oasis/oases] in the world.
If it makes a difference, these are metaphorical oases.
Thank you in advance for your help!