Because this is such a common use for weak references, WeakHashMap, which USES weak references for keys (but not for values), was also added to the class library in JDK 1.2.

因为这是弱引用最常见的用法，WeakHashMap也被添加到JD k 1.2的类库中，它对键(而不是对值)使用弱引用。

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DES defines some keys to be weak and therefore not suitable for encryption.

DES定义了一些弱的、因而不适合用于加密的密钥。

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The paper first analyzes the cause for weak keys in IDEA, and further offers an improved algorithm of the variable length keys.

该文介绍了IDEA算法，并分析了IDEA算法存在弱密钥的原因，研究设计并实现了变长密钥的IDEA算法。

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