Environment entry, a single-value parameter that can be used to configure how the application will operate.

环境条目，是一个单值参数，可以被用来配置应用如何操作。

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Returns a collection of properties for the type of array specified by the value parameter, using the specified context.

使用指定的上下文返回值参数指定的数组类型的属性的集合。

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Whether that amount is a set percentage of the account value or a hard dollar amount does not matter as much as having the parameter in place.

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The NSTextAlignmentNatural value is unsupported and will throw an exception when used with the textAlignment property of UILabel or supplied as the alignment parameter to the drawInRect:withFont:lineBreakMode:alignment: method of NSString.

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