POLabbr.石油；燃料与润滑剂（=petroleum；oil and lubricant）abbr.北极星导弹（=Polaris）Polmix多粘菌素B[多肽类抗生素]

1. The task for ecologists is to untangle the environmental and biological factors that hold this intrinsic capacity for population growth in check over the long run.
   生态学家的使命就是调查清楚环境和生态因素长期以来是如何控制这种致使种群增长的内在能力的。