The overall process of constructing a hydropower project is the sub-period of controlling and leading flood.

水电水利工程建设的总 过程就是分时段对水流 进行控制和疏导的 过程。

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Spectrum analysis is also conducted with the result that the significant period is about 20 years and the sub-period are 2.2 and 3.3 years.

从谱分析结果判断，年降水量具有20年的主振荡周期和3.3年、2.2年的次周期，并出现与太阳黑子变化反位相的特征。

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It is evidently concluded that Jurassic rocks in this area have undergone burial diagenesis, and can be classified as B sub-period of eogenetic, A sub-period of telogenetic and epidiagentic stages.

根据成岩作用现象及划分标志，本区侏罗系地层可划归于埋藏成岩阶段的早成岩B亚期，晚成岩A亚期及表生成岩期。

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Even if the Commission turns out to be right, that would be a very long period of sub-par performance.

BBC: Eurozone: A very overcast outlook

After all, the period of sub-par growth is now 21 quarters old.

FORBES: Bernanke Still Pouring Shots Of QE To Markets Already Drunk On Liquidity

All of this happened against the backdrop of many parts of the northern hemisphere being gripped by a prolonged period of sub-zero temperatures.

BBC: Climate scepticism 'on the rise', BBC poll shows