Distribution of reservoir physical parameter is always the bottleneck problem and difficulty of reservoir description.

储层物性参数的分布一直是油藏描述的关键问题和难点.

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GPS multipath disturbance is a bottleneck problem that limits accuracy of Global Positioning System ( GPS ) positioning.

多路径 效应影响是目前限制GPS定位精度进一步提高的瓶颈.

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