3 sentences

1. 这家商店承诺只售卖原装正品。

   zhè jiā shāng​diàn chéng​nuò zhǐ shòu​mài yuán​zhuāng zhèng​pǐn.

   This store promises to sell only genuine, original products.

   Source: Dong Chinese Dictionary

2. 这台相机是原装进口的，质量很有保证。

   zhè tái xiàng​jī shì yuán​zhuāng jìn​kǒu de, zhì​liàng hěn yǒu bǎo​zhèng.

   This camera is an original import, so the quality is guaranteed.

   Source: Dong Chinese Dictionary

3. 修理这台发动机需要更换几个原装配件。

   xiū​lǐ zhè tái fā​dòng​jī xū​yào gēng​huàn jǐ gè yuán​zhuāng pèi​jiàn.

   Repairing this engine requires replacing several original parts.

   Source: Dong Chinese Dictionary