Twin studies have allowed us to be more reflective about what people are actually born with and what's caused byexperience.
对双胞胎的研究让我们能够更多地反思人们先天的特质，以及后天经验导致的特质。
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Such questions have a range of answers that are supplied byexperience, by physical requirements, by limitations of available space, and not least by a sense of form.