3 sentences for 放大 (fàng​dà — magnify)

1. 他用放大镜观察树叶的纹理。

   tā yòng fàng​dà jìng guān​chá shù​yè de wén​lǐ.

   He used a magnifying glass to observe the texture of the leaves.

   Source: Dong Chinese Dictionary

2. 这种显微镜能把物体放大一千倍。

   zhè zhǒng xiǎn​wēi​jìng néng bǎ wù​tǐ fàng​dà yī​qiān bèi.

   This microscope can magnify objects a thousand times.

   Source: Dong Chinese Dictionary

3. 由于光线突然变暗，他的瞳孔不由自主地放大了。

   yóu​yú guāng​xiàn tū​rán biàn àn, tā de tóng kǒng bù​yóu​zì​zhǔ dì fàng​dà le.

   His pupils dilated involuntarily as the light suddenly dimmed.

   Source: Dong Chinese Dictionary