He didn't speak much, he just smiled with that serene smile of his.

他没有多说，仅是面含他特有的安详微笑。

《柯林斯英汉双解大词典》

He just smiled.

他只是笑了笑。

youdao

He just smiled a gentle smile but said nothing.

他只是温柔地笑了笑，没说一句话。

youdao

He just smiled and said, "A man ain't nothing but a man.He has just got to do his best."

VOA: special.2009.02.21

When they tried to be outraged, he just smiled as though he were embarrassed for them.

NEWYORKER: The Swan

"I asked McClaren who would be the next England captain, but was told nothing, he just smiled at me, " said Benitez.

BBC: SPORT | Football | Internationals | Benitez suggests Gerrard for role

Bill just smiled indulgently as he observed the scene.

NPR: Sergeant Notes Odd Rituals of War in Afghanistan