- hard-to-drill
- 难: catastrophe; calamity; disas ...
- 钻进: worm one's way in; drilling
- 的: 4次方是 The fourth power of 2 i ...
- 金刚石钻进的钻孔: diamond drill hole; diamonddrill hole
- 钻粒钻进的井筒: shot-drilled shaft
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难钻进的的英文
- hard-to-drill
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