The combination of vertical derivatives and upward continuation of gravity field is efficient to display the features of shallow structure.

将重力场的垂直导数和向上延拓结合起来，有利于揭示地壳上部构造特征。

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Prestack migration of common shot records is very sensitive to the velocity input, and demands a kind of continuation formula which can adapt to both vertical and lateral velocity variations.

共炮记录叠前偏移对输入的速度非常敏感，要求偏移中所使用的延拓公式能较为精确地适应速度的纵横向变化。

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In a continuation of the vertical-integration habit, Indian firms have spent billions buying up coal resources in Australia and Indonesia.

ECONOMIST: Inbound and outbound deals