scatter-brain

n (infml 口) person who cannot concentrate on one thing for very long, is forgetful, etc 精神不集中的人; 健忘的人.

scare, scarecrow, scared, scaremonger, scarf, scarify, scarlet, scarlet fever, scarlet runner, scarlet woman, scarp, scarper, scarred, scary, scat, scathing, scatological, scatology, scatter, scatter (also scattering), scatter-brained, scattered, scattily, scattiness, scatty, scavenge, scavenger, SCE, scenario, scenarist, scene, scene-shifter, scenery, scenic, scenically, scent, scepter, sceptic (US skeptic), sceptical, sceptical (US skeptical),