The method takes a parameter, specifying the length of the timeout, and a code block, specifying which content to rebuild when the content expires.
此方法接受参数，用来指定超时的时长，它还接受一个代码块，用来指定当内容过期时哪些内容需要重建。
To use volume as a building block for a code block that returns the length of a line segment, I can perform either partial application or currying.
要使用volume作为代码块的构建块并返回线段的长度，可以执行部分应用或局部套用。
To use volume as a building block for a code block that returns the length of a line segment, I can perform either partial application or currying.
要使用volume作为代码块的构建块并返回线段的长度，可以执行部分应用或局部套用。
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