客户机应用程序与数据图进行交互来获得数据和改变数据。
The client application interacts with the data graph to get data and change data.
这意味着以函数式语言编写多线程应用程序要容易得多，因为不可变数据结构与线程交互起来非常自然，因而代码可以很简洁。
This means that it is much easier to write multi-threading applications in functional languages because immutable data structures inherently interact cleanly with threads.
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