3 sentences

1. 一年有四时：春、夏、秋、冬。

   yī nián yǒu sì shí: chūn, xià, qiū, dōng.

   A year has four seasons: spring, summer, autumn, and winter.

   Source: Dong Chinese Dictionary

2. 一年有四个季节：春、夏、秋、冬。

   yī nián yǒu sì gè jì​jié: chūn, xià, qiū, dōng.

   There are four seasons in a year: spring, summer, autumn, and winter.

   Source: Dong Chinese Dictionary

3. 春夏秋冬的轮回是不可抗拒的自然规律。

   chūn xià qiū dōng de lún​huí shì bù kě kàng​jù de zì​rán guī​lǜ.

   The cycle of the four seasons is an irresistible law of nature.

   Source: Dong Chinese Dictionary