Animal excrement emits gases, such as hydrogen sulfide and ammonia, that poison the air around farms, as well as methane and nitrous oxide, which are major contributors to global warming. 动物的排泄物释放出的气体,例如氢化硫、氨气、污染了农场周围的空气,同时,甲烷和一氧化氮则是导致全球变暖的主要元凶。
Poisonous plant can cause human and animal poison or dead, but it is useful to mankind and daily life. 有毒植物是能引起人类或其它生物中毒死亡或有机体长期或暂时性伤害的植物。但是,有毒植物也有积极有益的一面,在人类生活、生产中起着很大作用。