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QUICK ANSWER
"OK" is an interjection which is often translated as "OK", and "me parece bien" is a phrase which is often translated as "I think it's fine". Learn more about the difference between "OK" and "me parece bien" below.
OK(
oh
-
key
)An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
me parece bien(
meh
pah
-
reh
-
seh
byehn
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. I think it's fine
Me parece bien vivir según tus principios.I think it's fine to live according to your principles.
b. I think it's right
Me parece bien que nos respetemos mutuamente.I think it's right that we should respect each other.