A faint smile passed over the doctor's face.

医生的脸上掠过一丝笑意。

She threw me a faint smile.

她对我微微一笑。

A faint smile played on her face.

她脸上浮起了笑容。

A faint smile flickered across her lips.

她嘴角上掠过一丝微笑。

His faint smile, I walked past.

他淡淡的笑着，我走了过去。