I cannot tell you whether the aid we have spent in the past has made a difference, but can we come back here in 30 years and say, "What we have done, it really prompted a change for the better."
過去に費やした援助が 差を生みだしたかどうか 分かりませんが 30年後に この場に戻り “私たちのやったことが 良い方向へ進んでくれた！” と言えるでしょう