오늘의 영어단어 & Voca

"Exercise has had a Goldilocks problem, with experts debating just how much exercise is too little, too much or just the right amount to improve health and longevity."

"Doctors don’t yet have definitive answers to these questions, partly because smartphone apps are so new."

"If those consumers are already healthy, the apps won’t do them any good."

"New research suggests that contrast sensitivity can be improved with brain-training exercises."

"At night, an older driver may squint to see the edge of white road stripes on blacktop."

"When an older adult descends a flight of stairs, for example, she may not tell the edge of one step from the next, so she stumbles."