3 sentences

1. 良好的教育为他的人生打底。

   liáng​hǎo de jiào​yù wèi tā de rén​shēng dǎ​dǐ.

   A good education laid the foundation for his life.

   Source: Dong Chinese Dictionary

2. 喝酒前先吃个馒头打底，不容易醉。

   hē​jiǔ qián xiān chī gè mán​tou dǎ​dǐ, bù róng​yì zuì.

   Eating a steamed bun to line your stomach before drinking makes you less likely to get drunk.

   Source: Dong Chinese Dictionary

3. 画家先用铅笔在画布上打底，然后再开始上色。

   huà​jiā xiān yòng qiān​bǐ zài huà​bù shàng dǎ​dǐ, rán​hòu zài kāi​shǐ shàng​shǎi.

   The painter sketches a base with a pencil on the canvas before starting to paint.

   Source: Dong Chinese Dictionary