両国の交渉は予想以上に円滑に進んだ。
Negotiations between the two countries went more smoothly than expected.
会議を円滑に進めるため、事前に資料を配っておいた。
I handed out the materials in advance so the meeting would run smoothly.
部署間の円滑な連携がプロジェクト成功の鍵だ。
Smooth cooperation between departments is the key to the project's success.