velocity of increase 增长速度 ; 增加速率
The reward for building a successful space sail would be to increase the velocity of a spacecraft indefinitely without the need for propellant.
制造一个成功的空间帆带来的好处是可以在无需推进剂的情况下加速航天器。
And the curl of a force field tells you how quickly the angular velocity is going to increase or decrease. OK.
力场的旋度告诉你，角速度增加或减小的快慢。
In other words, its mass must increase without limit when its velocity approaches the velocity of light.
换句话说就是，当它的速度接近于光速时，它的质量肯定无限制的增大了。
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