One spring, when I was in high school, a friend taught me the Korean word for forsythia. I didn't know what it was called in English, so I couldn't tell her, and for quite a while after that, I only knew the Korean word for it.
I don't remember when I learned the word "forsythia," or when the Korean word or my friend's name fell from my memory. But every spring, I see the yellow blossoms and I think of her.