古代某些文化中，杀婴行为在极端贫困时期被视为生存手段。

In some ancient cultures, ___child-killing was considered a means of survival during extreme famine.

环保组织称这种污染政策是对未来几代儿童的变相扼杀。

Environmental groups called the pollution policy a form of ___child-killing for future generations.