For instance, teams of blind children can enjoy fast -moving games of soccer with a bell inside the ball and a new hand -held ultrasonic device to guide them.
比如，一队盲人可借助内装有铃的球和指导他们的超声装置来欣赏快速运动的足球赛。
For instance, teams of blind children can enjoy fast -moving games of soccer with a bell inside the ball and a new hand -held ultrasonic device to guide them.
比如，一队盲人可借助内装有铃的球和指导他们的超声装置来欣赏快速运动的足球赛。
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