Immigration to the U.S. is causing a brain drain in some countries.
Immigration to the U.S. is causing a brain drain in some countries.
（纷纷）移民到美国（的现象）在一些国家造成了人才外流。
Immigration to the U.S. is causing a brain drain in some countries.
（纷纷）移民到美国（的现象）在一些国家造成了人才外流。