Even among identical twins there is a great deal of variation in personal preference, environment, and hence the risk for disease.
甚至是在同卵双生子中，在个人偏好、环境都有很大差异，因而疾病风险也有差异。
A free science library and personal learning tool that currently concentrates on genetics, the study of evolution, variation, and the rich complexity of living organisms.
Scitable—免费的自然科学图书馆和个人学习工具，目前专注于遗传学、进化论、变异学以及生物复杂性等领域。
Gender and age are generally linked with other situational and personal variables, making it difficult to determine specific sources of variation.
性别和年龄与其它的环境和个人变量普遍联系，以致很难测定变动的真正来源。
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