“适者生存”只是对自然选择学说的日常描述，更专业的描述则关注存活和生殖的水平差异。
“Survival of the fittest” is a conversational way to describenatural selection, but a more technical description speaks ofdifferential rates of survival and reproduction.
生殖特征决定了明党参和峨参在小区组上分布规律的差异，结果导致明党参的聚集程度远远不及峨参。
Procreation characteristics decide the difference spatial pattern between those two species in small classes and the degree of aggregation of C.
不同生殖方式的雌性个体平均寿命及产卵率均有所差异。
The average life and spawning rate are different in female individuals with different reproductive modes.
目的：对不同发育阶段的人胚胎原始生殖细胞（PGC）进行定位并比较其体外培养的差异。
Objective: To study the localization and in vitro culture of human embryonic primordial germ cell(PGC) during different stages of embryogenesis.
试验表明，沙棘不同种源的营养生长和生殖生长以及果实生化成分都存在明显的差异。
There are significant differences in growth in the young tree stage among different provenances of Sea Buckthorn and the differences are obvious with different geographic population variation.
不同林龄的栓皮栎林生殖物候和生殖能力有差异，幼龄林低，老龄林高；
There are differences in phonology and reproductive ability between forests at different age.
不同林龄的栓皮栎林生殖物候和生殖能力有差异，幼龄林低，老龄林高；
There are differences in phonology and reproductive ability between forests at different age.
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