1. Mary did not want to copulate with her boyfriend before marriage
   瑪麗不肯在出嫁前與她的男閨蜜會出現性社會關系。
2. Some animals perform elaborate mating rituals before they copulate.
   個別動物在雜交前應去更復雜的交歡典禮。
3. The male bird performs a sort of mating dance before copulating with the female.
   本身雄鳥在與雌鳥交尾己前要跳屬于交歡舞。