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- 速度一种向量,其量值为物体的速率,其方向为物体运动的方向
A vector quantity whose magnitude is a body's speed and whose direction is the body's direction of motion.
- 可量化的值可以用数字形式描述出来的特性,例如球体的面积或者向量的长度
A property that can be quantitatively described, such as the volume of a sphere or the length of a vector.
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海词词典,十七年品牌