The iPod touch user string differs in that the beginning of the parenthesized expression is iPod, rather than iPhone.

iPod touch用户字符串的不同之处在于括号表达式的开头为iPod，而不是iPhone。

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On the other hand, it can be used within a parenthesized expression or within the second expression of a conditional operator in such contexts.

另一方面，它可以使用在一个带括号的表达式或在第二个表达式在这样的环境条件操作符。

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To call a function and use its return value as part of a larger expression, simply name it and append a parenthesized argument list.

要调用函数并使用它的返回值作为语言表达式的一部分，只需要命名它并附加一个使用圆括号括起的参数列表。

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