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磨钻的使用是必不可少的。
The use of the power drill is indispensable.
youdao
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永久型封隔器由容易钻掉或者磨铣掉的材料制成。
Permanent packers are constructed of materials that are easy to drill or mill out.
youdao
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永久型封隔器由容易钻掉或者磨铣掉的材料制成。
Permanent packers are constructed of materials that are easy to drill or mill out.
youdao