语言发展的关键期是在幼儿期.The critical period of language development in early childhood.良好的幼儿期教育很重要, 这一点不言而喻.It's a no - brainer, of course , that high - quality child care is important.幼儿期的成长相当快.Growth is rapid in infancy....

“幼儿期”的英语可以翻译为：infancy ...