We first uncovered this surprising relationship while studying differences in the amount of mental effort people used to complete memory tasks.

首先发现了这种令人惊讶的关系， 同时研究了人用于完成记忆任务的脑力劳动量的差异。

But it turned out, a quarter of the time, there was a difference in how much the Neanderthal copy was expressed compared to the modern human version.

但事实证明， 有四分之一的时间，与现代人类版本相比， 尼安德人副本的表达量存在差异。

The relative amount of these two kinds of water varies greatly from one kind of rock or sediment to another, even though their porosities may be the same.

尽管孔隙率可能相同，但从一种岩石或沉积到另一种岩石或沉积，这两种水的相对量差异很大。

Now Fries has remarked in regard to plants, and Westwood in regard to insects, that in large genera the amount of difference between the species is often exceedingly small.

现在弗莱斯和韦斯伍德昆虫发表了评论， 在大属中，种之间的差异量往往非常小。

Hence, without rejecting the consideration of the present existence of intermediate gradations between any two forms, we shall be led to weigh more carefully and to value higher the actual amount of difference between them.

因此，在不拒绝考虑任何两种形式之间目前存在的中间等级的情况下，将被引导更仔细地权衡并更重视它之间的实际差异量。