somatic copulation

例句：

1. 1. The somatic copulation of the two species is crucial for their survival.
   这两种物种的体液性交对其生存至关重要。
2. 2. In some cases, somatic copulation can lead to genetic diversity.
   在某些情况下，体液性交可能导致遗传多样性。
3. 3. Somatic copulation has been shown to be more efficient than sexual reproduction in some organisms.
   研究表明，某些生物体的体液性交比性生殖更为高效。