但是,稀土生产往往带有放射性,加工企业在冶炼和分离稀土时,也经常使用危险的化学品,周围的空气、水和土地容易遭到污染。
However, rare earth is often radioactive. Moreover, in the smelting and extraction of rare earth, dangerous chemicals are frequently used, thus polluting local air, water and land.
Farihi及其团队观察了斯隆数字巡天项目探测到的带有特定钙污染光谱标志的146颗白矮星。
Farihi and his team looked at 146 white dwarfs detected by the Sloan Digital Sky Survey that show the spectral signature of calcium pollution.
拉尼•帕德森告诉每日邮报网站说:“无人机四周的一圈布料带有负离子,能吸走空气中漂浮的污染物和颗粒物。”
'The fabric that goes around the drone has minus ions, which attracts pollutants and particles flying in the air, ' Lani Paderson told Dailymail. com.
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