2 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. 这两家公司的竞争导致了双方的尖锐对立。

   zhè liǎng jiā gōng​sī de jìng​zhēng dǎo​zhì le shuāng​fāng de jiān​ruì duì​lì.

   Competition between the two companies has led to sharp antagonism.

   Source: Dong Chinese Dictionary