Hi everybody. Today, I&#39m at Del Sol High School, in Las Vegas, to talk with students and families about immigration.大家好！今天，我来到了拉斯维加斯的德素高中，与这里的同学和家长们谈论移民问题。We are a nation of immigrants. It has always given America a big advantage over other nations. It keeps our country young, dynamic, and entrep