列表表达式是返回一列资源或可以被转换成一列资源的结果的任何表达式。
A list expression is any expression that returns a list of resources or a result that can be converted to a list of resources.
列表表达式是返回一列资源或可以被转换成一列资源的结果的任何表达式。
A list expression is any expression that returns a list of resources or a result that can be converted to a list of resources.
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