Invoking the toUpper function is required in order to determine whether or not the tuple satisfies the query.

要确定元组(tuple)是否满足查询，必须调用toupper函数。

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The first statement calls a function (in this case, toUpper, which converts a character to uppercase) on each element of a list.

第一个语句在列表的每个元素上调用函数(本例中为toUpper，用于把字符转成大写)。

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The implementation of this interface involves having each of the toUpper and toLower operations delegate to the appropriate command objects.

这个接口的实现分别包括指定到适当的command对象的toUpper和toLower操作。

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For example, the toUpper service takes a single parameter named operand and returns the upper case transformation of the resource identified by the URI supplied as the argument.

例如，toUpper服务带有一个叫做operand的参数，并且返回参数uri所表示的资源的大写形式。

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For example, the toUpper service takes a single parameter named operand and returns the upper case transformation of the resource identified by the URI supplied as the argument.

例如，toUpper服务带有一个叫做operand的参数，并且返回参数uri所表示的资源的大写形式。

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