Dr. Smith was an old man with a long beard.

史密斯医生是个留着长胡子的老人。

This old man has a long beard.

这位老人留着长胡子。

My grandfather wears a long beard.

我的爷爷留了很长的胡子。

He stroked his long beard.

他捋了捋长长的胡须。

By thy long beard and glittering eye.

凭你的白须和闪亮的眼睛。