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他们形成的沟槽使碎屑从孔道逃脱；
They form channels through which chips escape from the hole;
youdao
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给出了孔道结构的定义。
The definition and classification of tunnel structure minerals are proposed.
youdao
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给出了孔道结构的定义。
The definition and classification of tunnel structure minerals are proposed.
youdao