求翻译：众所周知，由于地磁场的存在，埋地钢管在其磁化下会在周围产生异常磁场，此外，钢管常具有剩余磁性，也会在周围产生磁场异常。是什么意思？

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As is well known, as a result of the magnetic field in existence in the magnetized steel pipes, buried in the Anomalies arise around the magnetic field, in addition to steel tube often have a residual magnetic, will also generate a magnetic field around the unusual.

It is well known, as a result of the earth magnetic field existence, buries the steel pipe to be able to produce the anomalous field under its magnetization in periphery, in addition, the steel pipe often has the residual magnetism, also can produce the magnetic field in periphery to be unusual.

As we all know, due to the existence of the Earth's magnetic field, buried steel pipe under the magnetized exception is in the surrounding magnetic field, in addition, steel tubes often have residual magnetism, will also have a magnetic field around the exception.