值钱

这些旧书信虽然在市场上并不值钱，但在我心中却是最无价的珍贵回忆。

zhè xiē jiù shū xìn suī rán zài shì chǎng shàng bìng bù zhí qián, dàn zài wǒ xīn zhōng què shì zuì wú jià de zhēn guì huí yì.

Although these old letters are not valuable in the market, they are the most priceless and precious memories in my heart.