I just smiled sweetly and said no.

我只是温和地笑了笑，说了声“不”。

《柯林斯英汉双解大词典》

I smiled and said, firmly, "No." There would never be anything like that.

我坚定地微笑着并说道：“不，不是每件事情都像这样的。”

youdao

I passed a youth on 74th Street one morning recently and for no reason at all he smiled and said , " Hi .

最近的一个早晨，我在走到74号大道时遇上一个年轻人，没有特别的原因，他朝着我微笑并打招呼：“你好”。

youdao