A young man named John had just left school for the last time.
一个叫做约翰的年轻人刚刚从学校毕业。
For a long time, perforation is Just regarded as the last simple process in drilling.
长期以来，射孔被认为是钻井工程的最后一道简单工序。
For a long time, perforation is Just regarded as the last simple process in drilling.
长期以来，射孔被认为是钻井工程的最后一道简单工序。
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