The rainbow is set up as a symbol of the eternal covenant, a token of the eternal reconciliation between the divine and human realms.

彩虹，作为契约生效的标志,标志着神与人之间的永久共存。

耶鲁公开课 - 旧约导论课程节选

It allows for this map between a symbol, say a spoken word, and any sort of thought we want to use.

语言允许在符号,比如说出的一个词,与我们想要使用的任何想法之间,存在着这种映射关系

耶鲁公开课 - 心理学导论课程节选