在线英语听力室_免费在线英语听力学习网站

When Pablo Penda Sandoval made history with 3 home rounds in game one of the world series his head was probably buzzing but when batters¹ and chilli detroy hit the ball not quite right the next couple of nights it will be their hands that are buzzing those hurting hands are caused by vibrations³ in the bat after it  makes contact with the ball and when captured on high speed video they can actually see the players hands losing contact with the bat as it bents back and forth⁴ at a speed of 600-700 times a second but Penn has a solution a shock absorber in the bats knob that is tune⁵ to cancel out the vibration² frequencies that cause the most painful stings he presented a analysis of a new shock absorber on  10.22 at a meeting of acoustical society of America and thanks to a collaboration with baseball bat maker sports even if you cannot hit the ball on Swiss Ball like  Penda your hands may remain unstung