The FILTER keyword in SPARQL restricts the results of a query by imposing constraints on values of bound variables.
SPARQL中的FILTER关键字对绑定变量的值进行约束，从而限制查询的结果。
The expression is composed of data structures, bound variables (that is, those with a value), mathematical operations and function calls.
表达式由数据结构、绑定的变量（即具有值的变量）、数学操作符和函数调用组成。
A closure is a function that is evaluated in its own environment, which has one or more bound variables that can be accessed when the function is called.
闭包是在它自己的环境中执行计算的函数，它有一个或多个绑定变量可以在调用函数时访问。
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