On the other side of the coin, a slow life strategy, where the environment is perceived less hostile, gives rise to a slower rate of development.

在硬币的另一面， 一种慢生活策略， 即环境被认为不那么敌对，会导致更慢的发展速度。

The argument is that actually when you select against aggression in  animals, you're changing the time and the rate of development such that the experimental  foxes are actually frozen as juveniles.

争论的焦点是，实际上，当你选择对抗动物的攻击性时，你正在改变时间和发育速度，这样实验狐狸实际上就被冻结为青少年。