ZH-CN;mso-bidi-language:AR-SA">儿童语言的发展阶段是 mso-fareast-font-family:宋体;mso-bidi-font-family:"Times New Roman";mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">1.5 mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">岁以后的时间段