Among /ə’mʌŋ/: is used for three or more
Shirley had to choose among four universities she might attend.
Between /bɪ’twiːn/: refers to only two things
I couldn’t decide between blue and green.
Among: درمیان (۳ مورد یا بیشتر)
Between: درمیان (فقط۲ مورد)