So, it is necessary to further study movement and distribution of sediments in the flow.
因而进一步展开对泥沙运动及分布问题的研究是非常必要的。
So it is necessary to further study on well test design theory of low permeability gas reservoirs.
因此,有必要深入研究低渗透气藏气井试井设计理论与方法。
It is necessary to further study the characteristics of the propagation of potential environmental low frequency vibrations due to metro trains.
地铁列车引发的潜在环境低频振动的传播有何特征,有待于研究。
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