But there is a specter haunting immigration: Can the U.S. economy really provide decent wages for the 46 million workers expected in the next 50 years?

• 但是美国这麽依赖移民也有隐忧：在未来半个世纪内，预计会有4600万移民进入美国，美国经济真的能提供他们像样的工资吗?