The answer lies in two associated differences among the species, in their digestive systems and body sizes.

答案在于两个相关的物种之间的差异，它们的消化系统和体型。

youdao

In broad terms, the heritability of a trait measures the extent to which differences among members of a population can be explained by differences in their genetics.

广义上讲，性状遗传性衡量的是群体成员间的差异在多大程度上可以用基因差异解释。

youdao

Whether we learn about these differences by reading a book or by living abroad, our goal must be to respect differences among people in order to get along successfully with our global neighbors.

无论是通过读书还是在国外生活来了解到这些差异，我们的目的必须是尊重人与人之间的差异，与身边的外国人和睦相处。

youdao

Mister Boas believed that the environment people grow up in -- not family genes caused most cultural differences among people.

VOA: special.2010.01.17

The differences in wealth among their citizens were relatively small.

在城邦中,市民贫富差距,相对较小

耶鲁公开课 - 古希腊历史简介课程节选

This year's observance is meant to bring attention to the differences among suicidal individuals and their situations around the world.

VOA: special.2010.09.08

The probe by state attorneys general could be affected by major differences among U.S. states.

WSJ: Lenders Talk to States on Foreclosure Probes

And the overall figures conceal some large differences among specific groups of workers and would-be workers.

ECONOMIST: The widening gap

However, there were sharp differences among regions as well as the financial profiles of households.

BBC: Number of workless households falls again, says ONS