The ContactService has only an in-memory list (not persisting to disk) of contacts.

ContactService只有内存中的联系人列表(没有存储到磁盘)。

youdao

Event stores are conceptually simpler than full RDBMS solutions, and it's easy to scale up from an in-memory list of events to a full-featured event store.

事件存储器从概念上讲比全功能的关系型数据库解决方案要更简单，而且他可以很容易地从内存中的事件集合扩展到全功能的事件存储器。

youdao

youdao

These are sort of the cells, if you like, in memory that are holding the elements of the list.

记忆就像是数组中的元素,我们之前说的是，我在这里开始并且比较。

麻省理工公开课 - 计算机科学及编程导论课程节选

To get any location in memory, to get to any value of the list, I simply have to say which element do I want to get, I know that these things are stored in a particular size multiply that index by 4, add it to start, and then it's in a constant amount of time I can go to that location and get out the cell.

取得列表中的任何一个值,简单说来，想要取得列表中的任何元素,我知道这些元素存在特定的大小中,把下标乘以4，加到start上,然后定位到内存单元，并取出值就是固定的时间了,好的，如果元素以固定大小存储。

麻省理工公开课 - 计算机科学及编程导论课程节选

Write up a list with short items refreshing their memory on all you achieved while working with them.

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