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protected coal seam
protected coal seam
英
[protected coal seam]
美
[protected coal seam]
中文释义
被保护煤层
单词分析
单词结构:
protected coal seam
字母数:19
记忆提示
🎯 重点记忆:
单词拼写:protected coal seam
核心含义:被保护煤层
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更新时间:2025-12-21 09:25:41