The father buys,the son bigs,the grandchild sells,and his son thigs.
父买、子修建、孙儿卖,重孙街上当乞丐。
It was not forced upon them by the survival competition; they could have caught and lived on prey without using poison, just as the thousands of non-poisonous snakes still do.
毒液不是生存竞争强加给它们的,它们也可以不用毒液捕捉动物而生存,就像今天成千上万的无毒蛇那样。