Not too many people paid attention to this research until the last few years when, in this country especially, people are becoming curious about what happens to the brains of football players who bang their heads repeatedly.
很少人关注这个研究 直到最近几年 特别是这个国家，人们开始好奇 对于频繁用头顶球的足球运动员 他们的大脑会怎样呢