"The elephant has a very good memory."
Translation:Ο ελέφαντας έχει πολύ καλή μνήμη.
I put in the indefinite article μια in this sentence and it was wrong. Why? Does the word μνήμη go without an article in this kinds of sentences?
In sentences such as these, it seems very hard to tell whether we are talking about a general subject (all elephants) or one specific elephant, and so I cannot tell whether the object needs an article or not. COuld someone explain this to me?