问题描述：
请帮忙分析个句子,如下
The Obama budget would limit the yearly increase to social security payments by using a different method to measure inflation.
第一个to在句中是什么作用.
The Obama budget would limit the yearly increase to social security payments by using a different method to measure inflation.
第一个to在句中是什么作用.
问题解答：
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