The reasons can be divided into the gender difference hypothesis, self choice hypothesis and indoctrination hypothesis, etc.

对经济学者更利己的原因解释分为性别差异假说、自我选择假说和教育灌输假说等。

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The alternative hypothesis -- that a difference in proportions exists in the population -- is statistically more likely to be true.

另一种假设 — 对象总体中存在着比例差异 — 在统计上可能更正确。

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First, it may be that their environment is causing the colour difference, a theory called the "exposure" hypothesis.

首先，“暴露”说认为颜色差异由环境因素引起。

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