因为每个元素B xi 依赖于大小都是线性的，一个完全的链式矩阵和向量乘积 A (B x) 的延迟求值(Deferred evaluation)是三次方的。在这种情况下，在这个表达式中我们需要重新引入临时变量。
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Deferred Query Evaluation 延迟的查询赋值
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} expressions, such as deferred evaluation and the option to set the value of an EL expression.
} 表达式的其他功能，比如延迟求值和设置 EL 表达式的值。
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These unitholders will receive the then-current net asset value of the units, based on the current market value of the underlying securities in the portfolio, less any remaining deferred sales charge, as of the evaluation time.
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