species richness短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 物种丰富度 The species richness of aquatic communities was reduced by 22 per cent with Roundup, a greater effect than was found with the insecticide Sevin or the herbicide2,4- D. 孟山都“终结者”除草剂减少了22%的水生群落物种，比杀虫剂西维因杀虫剂胺甲萘的商标名或除草剂2，4- D的杀伤力强。 wholeveg