英语语法分析

Boys and girls, taken as groups, have different interests, propensities and needs.

以群体来看，男生和女生的爱好、习性和需求都各不相同。

If these two groups have equal spending propensities, there is no aggregate impact.

如果这两群人具有相同的消费倾向，总体来看就没影响了。

The contradiction between this two propensities is inherent in the relation between words and images.

在这两个倾向之间的矛盾，是固有的文字和图像之间的关系。