Acceleration and velocity are both vectors.加速度和速度都是矢量。the velocity of light光速Einstein's theory links energy with mass and velocity of light.爱因斯坦的理论把能量同质量和光速联系起来....
露天游乐场的飞车就是想把人吓丢了魂儿。Fairground rides are intended to frighten the life out of you.露天花园容易被冷风吹透。An exposed garden may be chilled by cold winds.他在大雨瓢泼的露天场地演出时受了寒。He caught a chill while performing at a rain-soaked open-air v...