3 sentences

1. 阴和阳是对立统一的关系。

   yīn hé yáng shì duì​lì tǒng​yī de guān​xi.

   Yin and Yang are a unity of opposites.

   Source: Dong Chinese Dictionary

2. 中国文化讲究平衡，有阴必有阳，有刚必有柔。

   Zhōng​guó wén​huà jiǎng​jiu píng​héng, yǒu yīn bì yǒu yáng, yǒu gāng bì yǒu róu.

   Chinese culture emphasizes balance: where there is yin, there must be yang; where there is hardness, there must be softness.

   Source: Dong Chinese Dictionary

3. 这间屋子常年不见阳，感觉非常潮湿。

   zhè jiān wū​zi cháng​nián bù jiàn yáng, gǎn​jué fēi​cháng cháo​shī.

   This room gets no sunlight all year round and feels very damp.

   Source: Dong Chinese Dictionary