把覆盖层看作均匀介质而从实际观测所得的反射波或从折射波时距曲线求得的波速，统称为有效速度。
获取高性能是并行处理的重要目标之一，有效速度是其中较重要的因素。
To gain high performance is one of the purpose of parallel processing, in which effective speed is one important factor.
你的大脑无法以那样的速度有效获取信息。
Your mind cannot effectively absorb information at that pace.
在作战范围、有效载荷、飞行速度和打击移动目标的能力等方面，“旋风”式战机无疑要胜出一筹。
It is true that in terms of range, payload, speed and its ability to hit moving targets, the Tornado wins.
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