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- Retardation factor is the ratio of groundwater velocity and contaminant velocity,which is a important parameter to calculate and assess contaminant migration in groundwater. 阻滞系数是表征地下水渗流速度与污染物迁移速度的比值,是计算和评价污染物在地下水中迁移行为的一个重要参数。
- Chapter 1 is about behaviors of contaminants in environment, such as contaminant migration, transmission, transportation, concentration, cumulation and etc. 第一章介绍污染物在生态系统中的行为，包括污染物的迁移、转化、转运、浓缩、累积、放大等。
- Scientists have studied the migration of fish over long distances. 科学家研究过鱼类远距离回游的现象。
- contamination migration 污染物质的移行
- There has been a migration of people from the country to the towns. 人们从乡下移居城镇。
- Contamination can't be ruled out entirely. 污染是不能完全清除的。
- There was a huge migration of people into Europe because of the war. 因为战争，大量的移民涌入欧洲。
- The brass surface must be free of contamination. 黄铜表面必须未经沾污。
- Seabirds will fly from here to another place for migration every year. 海鸟每年都要从一个地方迁徙到另一个地方。
- Such contamination has been extensively studied. 人们对这种污染进行了大量研究。
- Moral contamination or corruption. 腐蚀精神上被腐化或堕落
- The contamination should be removed. 应该清除掉污染。
- An abnormal fear of dirt or contamination. 不洁恐怖对污物或污染的异常恐惧
- No product contamination absolute tightness. 没有产品污染的绝对气密性。
- By mid-October Operation Migration was ready. 到了10月中旬，迁徙行动的准备工作就绪。
- The other part is just contamination. 其他部分只是污染之物而已。
- Fast Explicit FD Time Migration. 二维快速显式有限差分时间偏移。
- We have five minutes before oxygen contamination. 在氧化之前我们有五分钟时间
- A Human Migration Fueled by Dung? 人类迁徙燃料来源于粪便?
- Center for Migration Studies of New York, Inc. 纽约迁移研究中心。
