您要查找的是不是：
- We should use anthracite to avoid air pollution. 我们应该使用无烟煤以防止空气污染。
- 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。
- Pollution control has cleared the air. 污染管制已净化了空气。
- Man is fighting a battle against pollution. 人类正在与污染作斗争。
- Pollution is still very much a live issue. 污染现象仍然是当前的大问题。
- The soil becomes more and more acidic as pollution mounts up. 随着污染的加剧，土壤的酸化越来越严重。
- A clamor in the press for pollution control. 在报纸上对污染控制的呼吁
- Water pollution imperils all kinds of marine life. 水质污染危及所有海洋生物。
- Pollution has stripped the trees of their foliage. 污染剥光了这些树的叶子。
- There has been a migration of people from the country to the towns. 人们从乡下移居城镇。
- We have freed the lake from pollution. 我们已经清除了该湖的污染。
- 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。
- Many young people could not resist the spiritual pollution. 很多年轻人不能抵制精神污染。
- 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。
- It will cause pollution and the destruction of our seas and oceans. 这会引起污染，破坏我们的海洋和江河。
- We are sad about the pollution of our beaches with oil. 我们很痛心石油对我们海滩的污染。
- migration pollution 迁移污染
- By mid-October Operation Migration was ready. 到了10月中旬，迁徙行动的准备工作就绪。
- Many people are concerned about the pollution of the environment. 许多人都关心环境污染问题。
- Fast Explicit FD Time Migration. 二维快速显式有限差分时间偏移。
