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.
研究区须家河组储层横向分布比较稳定，可对比性比较强，由西南向东北，孔隙度发育有递减的趋势；
The reservoir traverse quite be stable, but the relative property is quite strong, by the southwest to northeast, the characteristic of the porosity growth is degression tendency.
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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