It attempts to represent each sound of human speech with a single symbol.

它试图代表每个人讲话的声音与一个单一的符号。

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The send method invokes the method named by a single symbol parameter, which in this case is the name of the state_column.

send方法调用由一个符号参数命名的方法，在本例中其名称是state_column。

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These are method invocations, each taking a symbol as a single parameter.

这些都是方法调用，每一个都将符号作为一个单独的参数。

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Apple derives a single-digit proportion of group revenues directly from App Store downloads, but the store is a key symbol for the financial health of its iOS ecosystem.

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