对于像这样的受cpu限制的工作量，拥有比cpu多的线程(或执行组)将导致收益递减。
For a CPU-bound workload such as this one, having more threads (or execution groups) than CPUs leads to diminishing returns.
龄组结构的变化在垂直分带和坡度上呈递减趋势，在坡向上无明显分异。
The variety of age structure has the digression trend in the elevation and slope, but haven't obvious rule in slope.
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