Our intuitive concept of force includes such ideas as place of application, direction, and magnitude, and these are called the characteristics of a force.
力的直观概念包括力的作用点、大小、方向，这些被称为力的三要素。
Our intuitive concept of force includes such ideas as place of application, direction, and magnitude, and these are called the characteristics of a force.
力的直观概念包括力的作用点、大小、方向，这些被称为力的三要素。
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