straight ball-guide 直线滚珠导轨
Fraternal Straight Ball 友爱直线球
straight t ball 直线球
One is renowned for his hard, straight shot while the other is an expert at curling the ball around walls.
一个人以他的狠硬直球闻名,而另一个人则是穿越人墙的曲球专家。
Drag is the force of air resistance pushing against a ball's motion and slowing it down, while lift is a force causing a ball to swerve off a straight path.
拉力是一种物体在空气中所受到的阻力,它能产生与球运行方向相反的作用力,减缓球的运行速度,而升力则是一种能使物体偏离直线运行轨迹的力。
Lean on the ball as shown, keep the back flat or maintain its natural curve, with the legs straight.
身体俯卧于球体之上,动作如图所示。背部保持正直或保持自然弯曲状态,腿部伸直。
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