Lǎoshī yào wǒmen wēn gù ér zhī xīn, měi zhōu fùxí yí cì jiù zhīshi.
The teacher wants us to 'review the old to know the new' by going back over prior material each week.
Zài dú yí biàn zhè běn shū, wēn gù ér zhī xīn, zǒng yǒu xīn de tǐhuì.
Re-reading this book always brings fresh insights — reviewing old things yields something new.