Ida is one of the most immaculately preserved primate fossils ever found and, at 47 million years old, she comes from a key moment in our evolutionary history.
艾达是迄今为止所发现的保存最完美的灵长类动物化石，已有4700万年的历史，她来自我们人类进化史上的一个关键时期。
If the map already contains the key, the existing value for the key is preserved.
如果map已经包含这个键，那么这个键的现有值就会保留。
The key point is that this is a lossless transformation, information is preserved while the physical representation is changed.
关键的是这是一种无损转化，物理表示在改变时，信息是不变的。
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