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If a process or movement gains momentum, it keeps developing or happening more quickly and keeps becoming less likely to stop.
impetus
This campaign is really gaining momentum.
这场运动确实势头正猛。
They are each anxious to maintain the momentum of the search for a solution.
他们每个人都渴望能一直劲头十足地寻找解决的方案。
In physics, momentum is the mass of a moving object multiplied by its speed in a particular direction.
The position, energy, and momentum of particles vary over time in an unpredictable manner.
粒子的位置、能量和动量在不同的时间会发生变化，且变化的方式不可预测。
The planet's gravity can rob the comet of some of its orbital momentum.
该行星的重力会使这颗彗星丧失一些轨道势能。
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