His smile was warm and friendly.

他的微笑热情而友好。

《牛津词典》

Everybody can be a good citizen, because in many cases a friendly smile is all that is needed to build a better world.

每个人都可以成为一个好公民，因为在很多情况下，一个友好的微笑是建立一个更美好的世界所需要的全部。

youdao

For example, if you smile, your voice will sound warm and friendly, just the opposite, if you have an angry look on your face, it can make you sound unpleasant.

例如，如果你微笑，你的声音会听起来温暖和友好，相反，如果你脸上有一个生气的表情，它会让你听起来不愉快。

youdao

If you want people to see you as warm and friendly, she says,just smile.

VOA: special.2009.11.24

Language was the only barrier, but a friendly smile bulldozed that wall.

NPR: Untold Stories of Kindness

Expect a friendly smile and sudden pat on the back.

FORBES: Six Scientific Ways to Suck up Successfully

Walk down the street in Giddings and without fail, folks smile and offer a friendly hello.

CNN: Welcome to Little America: Lee County, Texas