在这个示例中，where子句的图形模式中的第一个三元组与foaf： name属性为“Jon Foobar”的节点匹配，并把它绑定到名为contributor的变量。

In this example, the first triple in the WHERE clause's graph pattern matches a node with a foaf: name property of "Jon Foobar," and binds it to the variable named contributor.

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WHERE子句引入第二个变量 concept并定义与图形匹配的三元组。

The WHERE clause introduces a second variable, concept, and defines triples that are matched against the graph.

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您不仅能够将序列直接传递给构造函数，还可以将拥有元组或字符串的变量传递给 list 构造函数。

You aren't limited to passing a sequence directly into the constructor; you can also pass a variable that holds a tuple or a string into the list constructor.

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