He hides his sorrow behind a smile.
- Il cache sa tristesse derrière un sourire.
He was attracted by her smile.
- Il était attiré par son sourire.
He grinned with delight.
- Il fit un large sourire de satisfaction.
I don't care if you don't like your Aunt Mary. You'll just have to grin and bear it while she's here.
- Je ne veux pas savoir si tu n'aimes pas ta tante Marie. Tu n'as qu'à juste te forcer à sourire et supporter tant qu'elle est ici.
She always talks with a smile on her lips.
- Elle parle toujours le sourire aux lèvres.
I saw a joyful smile on his face.
- Sur son visage, je vis un joyeux sourire.