为了解决这个问题，我们可以使用弱表（weak table），这样，不用的结果最后就会从表中删除。 借助于高阶函数（higher-order functions），我们可以定义一个通用的记忆化函数：
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弱表情 subtle expression
弱表达于 Weakly expressed in ; Weak expression in
软弱的表现 Weakness ; show of weakness
强/弱平衡表 Strength/Weakness Balance Sheet
虚弱或运动表现下降 weakness or decreased exercise performance
长期弱势表现 long-run underperformance
精神衰弱量表 psychasthenia ; PT
弱连续表示 [数] weakly continuous representation
懦弱的表现 the Brand of cowardice
美联储星期二发表的声明说，从上一次，也就是10月底的会议以来，美国经济前景进一步走弱。
In its statement, the Fed said that the economic outlook has weakened further since the committee's last meeting in late October.
美联储星期二发表的声明说，从上一次，也就是10月底的会议以来，美国经济前景进一步走弱。
In its statement, the Fed said that the economic outlook has weakened further since the committee's last meeting in late October. The u.
解决方案 有：sharding （基于主键值讲数据表分散到多个数据库中），复制，利用弱语义一致性的简化数据库。
Solutions include sharding (splitting up a table across multiple databases based on the primary key), replication, and usage of simplified databases with weakened consistency semantics.
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