2 sentences for 反 (fǎn — opposite)

1. 他正在研究反季节蔬菜的培育技术。

   tā zhèng​zài yán​jiū fǎn jì​jié shū​cài de péi​yù jì​shù.

   He is researching cultivation techniques for out-of-season vegetables.

   Source: Dong Chinese Dictionary

2. 这枚硬币的正反两面图案是一样的。

   zhè méi yìng​bì de zhèng fǎn liǎng miàn tú'àn shì yī​yàng de.

   The patterns on both sides of this coin are the same.

   Source: Dong Chinese Dictionary