4 sentences

1. 他用右手的食指按下快门。

   tā yòng yòu​shǒu de shí​zhǐ àn​xià kuài​mén.

   He pressed the shutter with the index finger of his right hand.

   Source: Dong Chinese Dictionary

2. 第一个指纹是你的右手食指。

   dì​yī gè zhǐ​wén shì nǐ de yòu​shǒu shí​zhǐ.

   The first fingerprint is your right index finger.

   Source: OpenSubtitles

3. 打篮球时我不小心把食指戳伤了。

   dǎ lán​qiú shí wǒ bù xiǎo​xīn bǎ shí​zhǐ chuō shāng le.

   I accidentally jammed my index finger while playing basketball.

   Source: Dong Chinese Dictionary

4. 他家食指浩繁，生活压力很大。

   tā jiā shí​zhǐ hào​fán, shēng​huó yā​lì hěn dà.

   He has a large family to support, so he is under great financial pressure.

   Source: Dong Chinese Dictionary