tā / yī / shí / shī / xīn / jìng / bǎ / zhòng / yào / wén / jiàn / dàng / chéng / fèi / zhǐ / rēng / le

他一时失心，竟把重要文件当成废纸扔了。

He briefly lost his senses and actually threw the important documents away as scrap paper.