Symbolic development

符号、标志认知能力的发展
比如：这是一篇论文的标题
Symbolic development in monolingual and bilingual infants
单语言和双语言环境中婴儿的符号认知能力发展
再比如：另外一篇论文的标题
A sociocultural perspective on symbolic development in primary grade
一个从社会文化角度出发地观点：小学一年级学生符号认知能力发展

象征性的进展
One positive, if largely symbolic development was that China for the first time had indicated it might be willing to pledge funds, Mr Zoellick said.
佐立克指出，一个积极的（即使在很大程度上只是象征性的）进展是，中国首次表示愿意捐赠资金。