The trade off is that by storing less information in the object, we limit the total amount of memory that can be used by the JVM.
折中的处理方法是通过在对象内存储更少的信息，限制可以被JVM使用的存储。
Japan spent twenty years in doubling its total foreign trade, while China spent the same amount of time in increasing its foreign trade by three times.
日本用了20多年时间才将其外贸总额翻了一番，而中国却翻了两番。
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