在古代某些文化中，杀害婴儿行为有时被当作控制人口的手段。

In some ancient cultures, ___infanticide was sometimes practiced as a means of population control.

历史上某些文化中，杀害婴儿的父母会受到严厉惩罚。

In some historical cultures, parents who committed ___infanticide were severely punished.