At the later stage, when the "window of opportunity" is passed, the child may face difficulties in learning languages other than his mother tongue.
之后，这个“绝佳时期”过去后，儿童再学习其母语之外的语言，就会相对困难很多。
In the 20th century, the study of the inscriptions on bones had become an "international" learning and a window of probing into China's ancient civilization and traditional culture.
20世纪，甲骨学已成为一门“国际性”的显学，是探讨华夏古代文明和传统文化渊源的前沿窗口。
All products are designed to teach toddlers and babies during an opportune window of time when they are learning to talk.
所有的产品通过恰到好处的方式来设计的以便让婴幼儿开始学习说话时掌握这些能力。
All products are designed to teach toddlers and babies during an opportune window of time when they are learning to talk.
所有的产品通过恰到好处的方式来设计的以便让婴幼儿开始学习说话时掌握这些能力。
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