就是说,能够推动人类进化的基因库的筛选,可以造福或摧毁作为一个整体存在的整个社会团体,也可以在各个生物体的层面上进行。
A drop in pH on the level identified in the study could have some very harmful effects. Acidic soil is paradise for nematodes, parasitic roundworms that destroy crops.在这项研究中表明PH值的下降可以导致很多非常严重的后果,酸化土壤是那些毁坏作物的线虫和寄生蛔虫的天堂。
You can't level a city to destroy a single military unit located there.不能因为摧毁一个军事目标而摧毁一座城市。