原级：countersink
现在分词：countersinking
countersinks什么意思
过去分词：countersunk
过去式：countersank
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1. 锪钻：- 扩孔钻, Core drills | - 锪钻 Countersinks | 丝锥、板牙, 铰刀 Taps, Dies, Reamers
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