Shell is the largest fieldoperator in Nigeria, and accounts for about half of the country's oil operations.
壳牌公司是尼日利亚最大的油田经营者，约占该国石油业的一半。
2
Unfortunately, the operation was being conducted under the direction of an agent who, though a capable interrogator, had little experience as a fieldoperator.
不幸的是这次行动的指挥是一个擅长室内审讯而对现场行动知之甚少的人。
3
In order to reconstruct the shape of scatterer d, we establish the relation between the scatterer and the far field pattern. The relation can be fixed by so called far fieldoperator f.