| 1. | However , experts came to teach them the abc of biological chain , urging prudence in jackal hunting . for without them as cleaners of the rotting carcases , epidemic may spread among the livestock . the herdsmen were only too glad to learn this
野生动物保护专家闻讯赶去，联系实际给牧民讲解生物链之间环环相扣的依存关系，劝告他们打豺也要谨慎，草原有可能因失去“清道夫”清除腐烂物而出现牲畜疾病蔓延。 |
