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在“鞍钢宪法”的光辉照耀下，我队与勘探所密切协作，最近在四号机的复杂岩层小口径金刚石钻进中，采用了泥浆护孔，初步取得成效。
In the light of “Angang’s Constitution”, our team cooperated closely with the exploration institute. In the recent drilling of small-caliber diamond of complex strata of No. 4 machine, the mud retaining hole was used and achieved initial success.