concretions的中文翻译

concretions

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2. The invention can be used for mining low coal seams containing other concretions, ordinary low coal seams, medium-thickness coal seams and high coal seams.: 在含其它结核的薄煤层、普通薄煤层以及中厚、厚煤层同样可以采用。

3. The invention can be used for mining low coal seams containing other concretions, ordinary low coal seams, medium-thickness coal seams and high coal seams.: 在含其它结核的薄煤层、普通薄煤层以及中厚、厚煤层同样可以采用。