Two unpregnant reasons of bitches after copulating many times
适龄母犬屡配不孕的两大原因
To prototype, the Xunwu has a copulating of turtle and snake.
原型意义而言，玄武含有龟蛇交尾与蛇体自环的意义。
The male bird performs a sort of mating dance before copulating with the female.
这种雄鸟在与雌鸟交尾以前要跳一种交欢舞。
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