It is an expression of the African roots of American culture, a musical medium that exemplifies the culture of the Africans whose culture came to dominate much of what is American.

它表现出美国文化植根于非洲，通过音乐媒介证明了非洲人的文化已经支配了美国人的文化。

youdao

An idiom is a group of words or an expression whose meaning often cannot be understood by looking at the meanings of the separate words in it.

习语是词组或者一种表达方式，其意义无法从孤立的单词意思中获得。

youdao

And this puzzle piece here colored in blue because it's a Boolean expression is just something that--whose answer is either a yes or no, 0 true or false, one or zero.

这个拼图染成蓝色,因为它是布尔表达式,它的结果只可能是肯定或否定，对或错，1或者。

哈佛公开课 - 计算机科学课程节选