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汉语拼音：wài lì

1.外部的力量。

2.指外界作用于某一体系的力，例如其他原子对某一原子的作用力，对该原子来说就是外力。

1. 外来的力量。

   北周 庾信 《哀江南赋》：“若 江陵 之中否，乃 金陵 之祸始，虽借人之外力，实萧墻之内起。”

2. 物理学术语。指外界作用于某一体系的力。例如其他原子对某一原子的作用力，对该原子来说就是外力。

• Kinetic energy can be destroyed, but momentum cannot be destroyed in the absence of a net external force on the system as a whole.

  动能可以被毁，但是动量不能，在整个系统外力，不存在情况下。

• Both Pioneers act as though an extra force beyond mere gravity is tugging at them from the direction of the sun.

  两台先锋号好象被顺着太阳的方向除了引力之外的外力牵引着一样。

• Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.

  一切物体在任何情况下，在不受外力的作用时，总保持相对静止或匀速直线运动状态

• It is beginning to understand the transition that occurred in agriculture, from brute force into biological force.

  而是要开始去理解发生在农业中的转变。从大规模外力的模式转为使用生物力量。

• Newton's first law of motion: Every body continues in its state of uniform motion or rest unless acted by an external force.

  牛顿第一运动定律：牛顿第一运动定律：一切物体总保持匀速直线运动或静止状态，直到有外力迫使它改变这种状态为止。

• Knowing the state of the rotational motion of a system, determine the external forces or external torques acting on the system.

  已知质点系的转动运动，求系统所受的外力或外力矩。

• form did not weight so much as gravity was not a pull so heavy as today , but a gentle push from outside forces.

  身体并不是很重，因为重力并不是象今天如此沉重的拉力，而只是来自外力的温和推力。

• For laying indoor, tunnel, canal and underground. Able to bear external mechanical forces, but unable to bear large pulling force.

  适用于室内、隧道、电缆沟及地下直埋敷设。电缆能承受机械外力作用，但不能承受大的拉力。

• But many tend to forget that the body has an extraordinary immune system built in to help the body heal itself without outside intervention.

  但许多人却忘记，身体本就有一套非凡的免疫系统来帮助它在没有外力干涉的情况下自愈。