美墨之间最为可行的协议、或者说可以想象得到的最佳的美国移民改革，并非是一夜之间就消除来自墨西哥以及南美的无合法证件的移民。
The best imaginable deal between the US and Mexico, or the best imaginable US immigration reform, will not eliminate the flow of undocumented migrants from Mexico and South America overnight.