时间比金钱更珍贵，你一定要好好利用。

Shíjiān bǐ jīnqián gèng zhēnguì, nǐ yídìng yào hǎohāo lìyòng.

Time is more precious than money; you really must make good use of it.

这些一手资料非常珍贵，对研究这段历史有很大帮助。

Zhèxiē yìshǒu zīliào fēicháng zhēnguì, duì yánjiū zhè duàn lìshǐ yǒu hěn dà bāngzhù.

These first-hand materials are extremely valuable and are very helpful for studying this period of history.

这本书对我来说非常珍贵。

Zhè běn shū duì wǒ láishuō fēicháng zhēnguì.

This book is very precious to me.