问一篇北美短文章中一句话的理解。。。

freesaUID: 2225142

Some modern anthropologists hold that biological evolution has shaped not only human morphology but also human behavior. The role those anthropologists ascribe to evolution is not of dictating the details of human behavior but one of imposing constraints- ways of feeling, thinking, and acting that "come natu- rally" in archetypal situations in any culture. Our "frailties" -emotions and motives such as rage, fear, greed, gluttony, joy, lust, love-may be a very mixed assortment, but they share at least one immediate quality: we are, as we say, "in the grip" of them. And thus they give us our sense of constraints.

　　Unhappily, some of those frailties-our need for ever-increasing security among them-are presently maladaptive. Yet beneath the overlay of cultural detail, they, too, are said to be biological in direction, and therefore as natural to us as are our appendixes. (前面半句中说they are said to be biological in direction是什么意思呢？作者是想说这些frailties也跟着我们人类一起进化了么？)We would need to comprehend thoroughly their adap- adaptive origins in order to understand how badly they guide us now. And we might then begin to resist their pressure.

freesaUID: 2225142

nobody can tell me...so sad。。。

simeonehuUID: 2134275

biological in direction不是说进化，而是说有进化上的生物意义，就好像阑尾那样可能因为生物的进化而适应或不适应。哎。。只是我的各人理解。