2 sentences

1. 长期饮食单一会导致身体营养不平衡。

   cháng​qī yǐn​shí dān​yī huì dǎo​zhì shēn​tǐ yíng​yǎng bù​píng​héng.

   A monotonous diet over a long period can lead to nutritional imbalances.

   Source: Dong Chinese Dictionary

2. 这种产品的功能比较单一，无法满足用户的多样化需求。

   zhè zhǒng chǎn​pǐn de gōng​néng bǐ​jiào dān​yī, wú​fǎ mǎn​zú yòng​hù de duō​yàng​huà xū​qiú.

   The function of this product is quite singular and cannot meet the diverse needs of users.

   Source: Dong Chinese Dictionary