意群训练:In order to understand the nature of the ecologists investigation,we may think of the density-dependent effects on growth parameters as the signal ecologists are trying to isolate and interpret,one that tends to make the population increase from relatively low values or decrease from relatively high ones,while the density-independent effects act to produce noise in the population dynamics.
gre阅读长难句的并不是一天两天就能解决的,需要考生的坚持和日常的积累。
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