英语语法分析

In many species, such characteristics include aggressiveness.

在许多物种中，这些特征包括侵略性。

Since both are strong on tact not so strong on the aggressiveness and tend to crave affection.

因为他们都很老练，不太有攻击性，也都渴望感情。

One is that people's capacity to outwit other species, not their aggressiveness, appears to be the dominant factor in human survival.

一个是人类生存的首要因素似乎是人类在智力上胜过其他物种的能力，而不是他们的侵略性。