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that's so, isn't it
そうですね、考えかんがえてみます。
That's so, I'll think about it.
そうですね、難しいむずかしい問題もんだいだ。
That's right, it is a difficult problem.
先生せんせいの言ういう通りとおりそうですね、改善かいぜんが必要ひつようです。
As you say, that's right — improvement is needed.