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确定教学或练习区是免于危险的
meaning in English
made sure teaching/practicing areas are free of hazards
Related Words
免于刑事处分
完全确定
创办确定
温度确定
指标确定
比例尺确定
确定退出
确定损失
确定界线
确定物
确定铰链轴,铰链轴确定法
确定阶段
确定节点导纳矩阵
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