故作正经gù zuò zhèng jīng

with affected seri ousness
❍ 李吉明见他不愿意谈下去，就敛住了微笑，向何子学～地说： “我们不谈了吧。”(艾芜《百炼成钢》96) Li Jiming saw that he was in no mood to talk. So,effacing his smile,and with affected seriousness,he said to He Zixue: “This will do today.”