If there is an abrupt change of direction in their energy, from vertical to horizontal, such as when they accelerate across the court, bouncing the ball, there is a real danger of personal injury.

如果有垂直于地平线的力量突然改变方向，例如当他们快速地穿过球场，跳起来拿球，这对个人的伤害是很严重的。

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If there is an abrupt change of direction in their energy, from vertical to horizontal, such as when they accelerate across the court, bouncing the ball, there is a real danger of personal injury.

如果有垂直于地平线的力量突然改变方向，例如当他们快速地穿过球场，跳起来拿球，这对个人的伤害是很严重的。

youdao