The mandatory index component, also called a parameter specifier, is a number starting from 0 that identifies a corresponding item in the list of objects.

强制“索引”组件(也叫参数说明符)是一个从0开始的数字，可标识值列表中对应的元素。

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The type of each parameter must match its format specifier.

每个参数的类型必须匹配它的格式指定者。

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An exception specifier can omit the parameter name when a catch needs to know only the type of the exception in order to handle it.

说明符的类型决定了处理代码能够捕获的异常种类。

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