瞬时速度 [力] instantaneous velocity ; [力] Instantaneous Speed ; momentary velocity
瞬时速率 instantaneous speed ; Instantaneous rate
瞬时速度中心 instantaneous velocity center ; instantaneous center of velocities ; instantaneous centre
瞬时速度 Instantaneous Velocity
柱塞瞬时速度 [机] momentary velocity of plunger
瞬时速度场 Instantaneous flow field
活塞瞬时速度 [机] momentary velocity of piston
瞬时速度调节装置 momentary speed adjusting device
瞬时风速 instantaneous wind speed
瞬时角速度 instantaneous angular velocity
这些就是v的定义，也就是瞬时速度。
那何为瞬时速率呢？
许多研究表明机动车的尾气排放量与车辆的瞬时速度、加速度密切相关。
Many studies have shown that the amounts of vehicle emissions are typically affected by vehicles' instantaneous speeds and acceleration rates.
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