4 sentences

1. 这件衬衫熨得很平整。

   zhè jiàn chèn​shān yùn de hěn píng​zhěng.

   This shirt is ironed very smooth.

   Source: Dong Chinese Dictionary

2. 这种装订方式能让书的切口非常平整。

   zhè zhǒng zhuāng​dìng fāng​shì néng ràng shū de qiē​kǒu fēi​cháng píng​zhěng.

   This binding method ensures the edges of the book are very smooth.

   Source: Dong Chinese Dictionary

3. 播种之前，农民会先把土地平整一遍，方便后期灌溉。

   bō​zhǒng zhī​qián, nóng​mín huì xiān bǎ tǔ​dì píng​zhěng yī biàn, fāng​biàn hòu​qī guàn​gài.

   Before sowing, farmers level the land first to make subsequent irrigation easier.

   Source: Dong Chinese Dictionary

4. 播种前需要先平整土地。

   bō​zhǒng qián xū​yào xiān píng​zhěng tǔ​dì.

   The land needs to be leveled before sowing.

   Source: Dong Chinese Dictionary