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城市公园绿地重金属污染主要来自于汽车尾气和轮胎磨损，重金属危害主要通过颗粒迁移进行。
The pollutants of heavy metals resulted from the exhaust gas and tyre abrasion, and the heavy metals' harm resulted from grain's move.
强磁场的磁化力和洛伦兹力通过控制初晶硅颗粒迁移行为来改变其在合金基体中的分布状态，通过影响凝固过程中的对流现象改变合金的凝固组织。
The results indicate that it is possible to control the behaviors of reinforced particles in the metal matrix by using intense magnetic fields in the solidification process of metal matrix composites.
通过扫描图像可以看出，土颗粒的重新排列直接反映了水分迁移的状态。
From scanning pattern, we can draw that the fresh arrange of soil grain directly reflects the state of moisture transfer.
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