- front pilot
- 前导: lead the way; march in front ...
- 部: part; section; division; reg ...
- 拉刀: broach; scraping out cutter
- 的: 4次方是 The fourth power of 2 i ...
- 拉刀的半精切齿: semi finishing tooth of broacher; semi-finishing tooth of broacher; semi-finishingtoothofbroacher
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