问题描述：
帮忙翻译几句话（不难）,给20分哦,翻的好再加20
To impose some order on this variety of patterns, one school of thought proposes dividing populations into two groups. These ecologists think that the relatively steady populations have "density-dependent" growth characteristics; that is, rates of birth, death, and migration depend strongly on population density.
To impose some order on this variety of patterns, one school of thought proposes dividing populations into two groups. These ecologists think that the relatively steady populations have "density-dependent" growth characteristics; that is, rates of birth, death, and migration depend strongly on population density.
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