In field practice, a subsurface is mapped by arranging a series of wave-train sources, such as small dynamite explosions, in a grid pattern…

第二句话对解释进行总的说明：“在实地作业中，通过将一系列波列源，诸如小规模炸药爆炸，排列成一个网格模式，从而将地下层面标绘出来。” 接下来是“地震反射法”的详细过程。

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By getting the deals completed, Thomas and Wright will be on the practice field the afternoon of July 27 when the Browns have their first workout with their veterans.

在这两份合同敲定之后，托马斯和赖特将出现在7月27日下午布朗队的训练营第一次练习中。

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The simulation results show that the results of finite element analysis agree well with that by measured in field practice.

模拟结果表明有限元分析计算结果与现场实际测量结果吻合度很高。

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TALLADEGA, Ala. (AP) Steady rain Saturday washed out qualifying at Talladega Superspeedway, where the field was set by practice speeds.

NPR: Edwards Gets Pole After Rain Washes Out Qualifying

Agricultural output was also greatly stimulated by the creation of three-field farming instead of the old Roman practice of two-field farming.

FORBES: Fact and Comment

The only way to discover whether they will arise in real life, or whether they will be any more damaging than similar risks posed by conventional crops and farming practice, is to do more research in the field.

ECONOMIST: Who��s afraid?