translation.en: Suppose we've got a group of little organisms -- they can be bacteria, they can be hamsters; it doesn't matter what -- and let's suppose that this little group here, they evolved to be cooperative.
translation.zh: 假如我们有这样一组小小的有机体 可能是细菌，可能是仓鼠的，这都无关紧要 假设这群组织将演化成互相合作的模式