问题描述：
求高手分析下句结构 特别说明to在这里的用法
the number crossing borders for undergraduate study i s growing as well,to 8 percent of the undergraduates at America’s best institutions and 10 percent of all underg raduates in the U.K.
the number crossing borders for undergraduate study i s growing as well,to 8 percent of the undergraduates at America’s best institutions and 10 percent of all underg raduates in the U.K.
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