✨ ベストアンサー ✨
abroad ≒ to/in a foreign country [to/in foreign countries]
と考えましょう。
〜例文〜
I want to go abroad, but I don't have enough money.
≒ I want to go to a foreign country, but I don't have enough money.
→「外国に行きたいが,十分なお金がない」
I'm going to study abroad for a week.
≒ I'm going to study in a foreign country for a week.
→「1周間外国で勉強する (=海外留学する) つもりだ」