Whales take twenty-four hours to copulate.

鲸用二十四小时来交配。

During the time she is paired to a male, the female allows no other males to copulate with her.

雌性与一雄性配对时，雌性不允许其他雄性与其交配。

I HAD never given much thought to how dolphins copulate, much less seen them doing it.

我从来没有如此关注过海豚的繁殖，因为几乎看不到它们繁殖的过程。

The intramedullary nail is mainly characterized by including a solid nail body, the upper section of which is an external screw thread rod and a copulate fixedly pressure-adding screw cap;

它的主要特征是包括实心体钉体，其上段为外螺纺杆及配合的固定加压螺帽；