brain-drain

n (usu sing 通常作单数) (infml 口) loss to a country when skilled and clever people emigrate from it to other countries 人才外流.

bracing, bracken, bracket, brackets, brackish, bract, brad, bradawl, brae, brag, braggadocio, braggart, brahmin, braid, braided, braiding, Braille, brain, brain fever, brain-child, brain-teaser, brainless, brainpower, brains trust (US brain trust), brainstorm, brainstorming, brainwash, brainwashing, brainwave, brainy, braise, brake, brake fluid, brake light (US stoplight), brake pedal, brake-horsepower, brake-shoe, bramble, bran, bran-tub,