名词
中文翻译：向量
同义词：
['direction', 'directional', 'directional vector', 'directional force', 'directional field']
例句：
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1. The vectorof the Earth's gravity is directed towards the center of the planet.
地球的重力方向指向地球的中心。
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2. The vector of the current is directed towards the southeast.
电流的方向指向东南。
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3. The vector of the force is directed towards the object.
力的方向指向物体。