natural reproduction

例句：

1. 1.In nature, animals reproduce naturally through mating and the birth of offspring.
   在自然界中，动物通过交配和后代的出生来自然繁殖。
2. 2.The company's strategy is to promote natural reproduction among employees.
   该公司的战略是促进员工之间的自然繁殖。
3. 3.The researcher found that some species have evolved to reproduce naturally without the need for artificial insemination.
   研究者发现，一些物种已经进化到不需要人工授精就能自然繁殖。