Question

きゅうりの漬物

この日本語の部分を英語になおすときの模範解答が写真2のようになっていたのですが
なぜforeign languageに aがつくのか分かりません💦

year, I went to onsen in winter, and I saw the English words. It was written on a
signboard. I only knew one meaning of "spring," so I didn't understand its
meaning. Summer is hot, but spring is warm, right?
qorie smi
*
Both English and Japanese have interesting words.｣外国語を学ぶことは、私にとって
おもしろいです。
I think so, too. Jim, if you have something that you want to know about Japanese,

It is interesting for me to learn a foreign language (.) / Learning [To learn] a foreign
language is interesting for [to] me (.)
本文
oy: Hi, Emily. What did you do last Sunday? Girl I went to Minami-boso with my family.
oy: Sounds good. How was the weather there?
Girl: What are you looking for, Bill? Boy I can't find my pen. I used it in the last class.

Answer 1

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Hiro トビタテ留学JAPAN

ここで「a foreign language」の部分は、どの外国語か具体的に言っていない（指定した言語ではない）ので、「とある外国語」や「どれかの外国語」って感じです。