gǔ / dài / dú / shū / rén / yào / jìn / rù / guó / zǐ / jiàn / zuò / jiàn / bì / xū / tōng / guò / yán / gé / de / xuǎn / bá

古代读书人要进入国子监坐监，必须通过严格的选拔。

In ancient times, scholars who wanted to study at the National Imperial Academy had to pass a strict selection.