kàn / dào / dì / di / yì / běn / zhèng / jīng / de / shuō / cuò / chéng / yǔ / dà / jiā / dōu / yǎ / rán / shī / xiào

看到弟弟一本正经地说错成语，大家都哑然失笑。

Everyone laughed involuntarily when they saw the younger brother seriously misuse an idiom.