In other sports，such as baseball and American football，the players' energy moves parallel to the ground and towards their opponents，so they wear helmets which give adequate protection to their heads.
In other sports，such as baseball and American football，the players' energy moves parallel to the ground and towards their opponents，so they wear helmets which give adequate protection to their heads.
在其它运动中，例如棒球和美式足球，选手的力量与地面平行并朝向对手，所以他们戴着头盔以给予头部足够的保护。