This is the 5878th most frequent Chinese word.
埃及
Egypt.
In this sentence, '埃及' is used as a proper noun and refers to the country Egypt, serving as the subject of the sentence.
埃及是一个拥有悠久历史的国家。
Egypt is a country with a long history.
Here, '埃及' is used to describe the culture associated with Egypt, acting as an adjective to qualify '文化'.
他对埃及文化非常感兴趣。
He is very interested in Egyptian culture.
In this instance, '埃及' specifies the location related to traveling, functioning as a descriptor in the context of the object '旅行的书'.