以下为句子列表：
英文: In so far as linear motion is concerned, a body is in equilibrium if the vector sum of the forces acting upon it is zero.
中文: 就线性运动而论，如果作用于严格物体上的诸力的矢量之和是零，那么这个物体就处于平衡状态。
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英文: While two (or more) electromagnetic waves of the same frequency, same direction of vibration, same phase or constant phase difference superpose in space, the amplitude of composite wave is vector sum of the amplitude of each wave.
中文: 由两个（或两个以上）频率、振动方向相同、相位相同或相位差恒定的电磁波在空间叠加时，合成波振幅为各个波的振幅的矢量和。
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