1.She had a thoughtful expression on her face.
她一脸沉思的表情。
2.He had more enemies and hatreds than anyone could easily guess from his thoughtful expression.
从他的思想表达方式难以被人猜透来看，他的敌人和仇家是不会多的。
3.His face took on a thoughtful expression.
他的脸上露出沉思的表情。
