Deaf communities have always known that infants can sign before they can talk, but hearing parents hadn't thought to follow suit.
失聪群体一直都知道婴儿在他们会说话前便会做动作，但是有听力的父母却从没有想过照着做。
Deaf communities have always known that infants can sign before they can talk, but hearing parents hadn't thought to follow suit.
失聪群体一直都知道婴儿在他们会说话前便会做动作，但是有听力的父母却从没有想过照着做。
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