She said she was enjoying herself but her smile was forced.

　　她說自己很快活，但是她的`笑容很勉強。

　　There was a ghost of a smile on his face.

　　他臉上露出隱隱的一絲微笑。

　　He never so much as smiled.

　　他從未笑過。

　　‘ Oh, hello, ’ he said, with a smile.

　　“嗨，你好。”他微笑著說。

　　The woman's fragile face broke into a smile.

　　那面孔秀麗的女子粲然一笑。