Soils that are traditionally defined as having an exchangeable sodium percentage greater than 6%—‘but there are many soils with lower sodium levels which exhibit similar behaviour’ (S. Raine and R. Loch 1995).
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。