单词pre-language
网络: 前语言；语言前期
the same color as pre-language, but do not have the same spectral reflectance curves, so they are all color metamerism.
二者颜色不异，但操纵不异的光谱不直射弧线，所以它们都是同色异谱色。
Comparison of vocalization development between normal and congenitally hearing impaired infants during pre-language period
正常与先天性重度聋婴幼儿言语前期言语发育的比较研究