Children follow the same pattern of physical development but each one at a different pace.小孩子身体发育过程都一样，但是发育速度却各不相同。Cells divide and renew as part of the human growth process.细胞不断地分裂更新，这是人体发育过程的一部分。The children's emotional development had been retarded by traumatic experiences.孩子们的感情发育过程因精神创伤而受到阻碍。