circulate bottoms up
自下而上循环
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The first step of the process was to perforate, and after the guns were fired, to circulate bottoms up to handle any possible influx of gas.
作业的第一步是射孔，射孔后循环一周以排除气体溢流的可能性。
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