3 sentences

1. 投影仪把幻灯片投影在银幕上。

   tóu​yǐng​yí bǎ huàn​dēng​piàn tóu​yǐng zài yín​mù shàng.

   The projector projects the slides onto the screen.

   Source: Dong Chinese Dictionary

2. 全息投影技术正变得越来越普及。

   quán​xī tóu​yǐng jì​shù zhèng biàn de yuè​lái​yuè pǔ​jí.

   Holographic projection technology is becoming increasingly popular.

   Source: Dong Chinese Dictionary

3. 为了更准确地展示地形，我们使用了墨卡托投影。

   wèi​le gèng zhǔn​què de zhǎn​shì dì​xíng, wǒ​men shǐ​yòng le Mò​kǎ​tuō tóu​yǐng.

   To represent the terrain more accurately, we used the Mercator projection.

   Source: Dong Chinese Dictionary