词汇	白垩线
释义	白垩线 chalk line
随便看	ecological explanation ecological exploitation ecological exploitation and renovationproject ecological exploitation and utilization ecological extinction ecological facies Ecological facter ecological factor ecological factors ecological factors stress ecological failure Ecological Fallacies ecological fallacy ecological fanning ecological farm ecological farmhouse ecological farming Ecological farms Ecological feasibility Ecological Feature ecological feedstuff ecological feminism ecological feminist consciousness ecological fertilizer ecological fertilizer with pesticides