}表达式的其他功能，比如延迟求值和设置EL表达式的值。
} expressions, such as deferred evaluation and the option to set the value of an EL expression.
Rope实现通常也将延迟对大型子串操作的求值，它的作法是引入子串节点。
Rope implementations also often defer evaluation of large substring operations by introducing a substring node.
Rope实现通常也将延迟对大型子串操作的求值，它的作法是引入子串节点。
Rope implementations also often defer evaluation of large substring operations by introducing a substring node.
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