translation.en: This is a really important process. It's partly dependent on the environment that the animal or the human is in, and the synapses that are being used are strengthened, and synapses that aren't being used in that particular environment are pruned away.
translation.zh: 这是非常关键的阶段 一部分取决于动物或人类居住的环境 那些有价值的突触会茁壮发育 而在那个特定的环境里