1. Much of the soil is usually still frozen during peak run-off. 大部分的土壤在径流高峰期仍然是冻结的。
2. What about run-off in the spring, when the snow finally melts? 到了春天，雪最终融化的时候，水流是怎么样的？
3. Once this pan formed, further run-off collected, and formed a lake. 一旦这个池子形成，径流就会进一步汇集，从而形成一个湖泊。
4. Agricultural run-off and pollution from power plants are adding extra nitrogen to many bogs in North America. 农业排水和来自发电厂的污染给北美的许多沼泽增加了额外的氮。
5. The nutrients are deep down in the active layer anyway, not high up near the surface, which is the part of the active layer most affected by run-off. 不管怎样，营养物质存在于活性层深处而不是在表层附近，活性层受径流影响最大的地方。
