记忆一个功能将为功能添加一个透明的缓存封装，因此已经得到的值将从缓存中返回而不是每次都重建。

Memoizing a function adds a transparent caching wrapper to the function, so that function values that have already been obtained are returned from a cache rather than being rebuilt each time.

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跟踪日志内的入口／出口点允许开发者随着时间的推移重建一系列方法的调用，同时重建指定的参数和返回的值。

The entry/exit points in a trace log allow developers to reconstruct a sequence of method calls over time, along with the parameters specified and values returned.

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即使一个攻击者获得权限看到你经过hash的密码，也不可能只从hash值重建密码。

Even if an attacker gained access to the hashed version of your password, it's not possible to reconstitute the password from the hash value alone.

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