selectivity of catalyst

例句：

1. 1.The new policy has increased the selectivity of the company's investment.
   新政策提高了公司的投资选择性。
2. 2. The scientist used selective breeding to improve the quality of the crop.
   科学家利用选择性育种来提高作物的质量。
3. 3.The researcher found that the selective pressures in the environment had a significant impact on the species' survival.
   研究者发现，环境中的选择性压力对物种的生存有显著影响。