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。

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.

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不过突然间，我的滑雪板却改变方向滑出斜坡往一堆树冲过去，而且我停不下来。

But suddenly, my snowboard veered off the slope and into the trees. I couldn't stop.

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例如同时运行着你不能突然改变方向，开始运行的角度大于45，没有变化的步伐度。

For example whilst running forward you can't suddenly change direction and start running in angles greater than 45 degrees with no change in pace.

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