7 sentences

1. 他竖起大拇指表示赞赏。

   tā shù​qǐ dà​mu​zhǐ biǎo​shì zàn​shǎng.

   He gave a thumbs-up to show his appreciation.

   Source: Dong Chinese Dictionary

2. 他不小心伤到了大拇指。

   tā bù xiǎo​xīn shāng dào le dà​mu​zhǐ.

   He accidentally injured his thumb.

   Source: Dong Chinese Dictionary

3. 大拇指在这儿呢。

   dà​mu​zhǐ zài zhè​r ne.

   The thumb's here.

   Source: OpenSubtitles

4. 看到我的大拇指是朝下的吗？

   kàn​dào wǒ de dà​mu​zhǐ shì cháo​xià de ma?

   See how my thumb is turned down?

   Source: OpenSubtitles

5. 那个孩子吮着大拇指睡着了。

   nà​ge hái​zi shǔn zhe dà​mu​zhǐ shuì​zháo le.

   The child fell asleep sucking his thumb.

   Source: Dong Chinese Dictionary

6. 他由于受伤，大拇指的甲已经脱落了。

   tā yóu​yú shòu​shāng, dà​mu​zhǐ de jiǎ yǐ​jīng tuō​luò le.

   Due to an injury, his thumbnail has fallen off.

   Source: Dong Chinese Dictionary

7. 童话里的主角大拇指虽然身材矮小，却非常勇敢。

   tóng​huà lǐ de zhǔ​jué Dà​mu​zhǐ suī​rán shēn​cái ǎi​xiǎo, què fēi​cháng yǒng​gǎn.

   Although the protagonist Tom Thumb in the fairy tale is small, he is very brave.

   Source: Dong Chinese Dictionary