serious-looking的用法和樣例：
例句
用作名詞 (n.)
- Natasha took the first note, her throat swelled, her bosom heaved, a serious expression came into her face.
娜塔莎唱出了第一個音，拉開了嗓門，挺起了胸脯，眼睛里露出嚴肅的表情。 - All three men were looking at ham with amazement.
那三人都以驚奇的神態望著他。 - A young officer, with an expression of bewilderment and distress in his face, walked away from the flogging, looking inquiringly at the adjutant.
年輕的軍官流露著困惑不安和痛苦的神態，從受懲罰的人身邊走開，帶著疑問的目光打量著騎馬從身旁走過的副官。
