She said she was enjoying herself but her smile was forced.
她说自己很快活，但是她的`笑容很勉强。
There was a ghost of a smile on his face.
他脸上露出隐隐的一丝微笑。
He never so much as smiled.
他从未笑过。
‘ Oh, hello, ’ he said, with a smile.
“嗨，你好。”他微笑着说。
The woman's fragile face broke into a smile.
那面孔秀丽的女子粲然一笑。