The default list element has a header, footer and detail section.
默认的列表元素有一个头，一个尾和细节部分。
The extra list element is actually added in line two of the append_options method.
额外的list元素实际上添加到 append_options方法的第二行。
The extra list element is actually added in line two of the append_options method.
额外的list元素实际上添加到 append_options方法的第二行。
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