在块内部的块变量类型推导。

Type inference for block variables within block calls.

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如果您在过程的生存期内多次进入该块，则每个块变量会保留它的前一个值。

If you enter the block more than once during the procedure, each block variable retains its previous value.

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若要避免在这种情况下出现意外结果，最好在块的开头对块变量进行初始化。

To avoid unexpected results in such a case, it is wise to initialize block variables at the beginning of the block.

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It turns out that slightly before the stack, slightly before this conceptual chunk of memory, there's other things called environment variables that we may see over time but elsewhere in memory are other things.

结果是稍微在堆之前，稍微在这个内存块概念之前，另外还一个东西叫做环境变量,我们之后可能看到，内存中的其他地方,是其他的东西。

哈佛公开课 - 计算机科学课程节选

But we said earlier that, you know, we're going to get - to the point where we want to have a lot of pieces of -- a lot of variables in memory, maybe 140,000 dictionary words for some future peace set, but we don't want to enumerate line by line by line 140,000 variables.

但是我们之前说过，你们知道的，我们将获得,有很多块--很多变量的内存的指针-,可能有140，000个单词的集合,但是我们不想一行行地列举,140，000行变量。

哈佛公开课 - 计算机科学课程节选