英文翻译：嘴角挤出一丝微笑

He forced a smile out of the corner o f his mouth.

He/She forced an unnatural smile

He or she is reluctant to smile

pile out a smile form the corner of his mouth

He forced a smile at the corner of his mouth.
There is a tinge of smile at the corner of his mouth

前者动态
后者静态

A flicker of a forced smile showed at the corners of her(his) mouth.