Suppose this is the flight path of the ball.I retreat to a position far behind the table.The ball has just fallen.I start with the paddle well above and behind the ball. 假設這是球的飛行路線(xiàn)，我退到離球臺很遠的地方，球正好落下來(lái)，我向球的后上方引拍。
Ensuring that the projectiles do not burn up or deform from reentry friction while sustaining a precise, nearly vertical flight path would be extremely difficult. 要確保炮彈不會(huì )因進(jìn)入大氣的摩擦而燒毀或變形，同時(shí)還要維持近乎垂直下降的精確飛行路線(xiàn)，可說(shuō)極為困難。
