综合全球各地的河流状况，估算结果表明：大气中人类造成的一氧化二氮排放至少有10%源于河流和溪流。
When summed across the globe, the results showed rivers and streams are the source of at least 10 percent of human-caused nitrous oxide emissions to the atmosphere.
那些状况较差的船只往往在河流中航行，大海中风暴对它们来说太强大太危险了。
The vessels which are in a bad condition usually sail on rivers as storms at sea can be very strong and detrimental for them.
尽管亚马逊河保持一般的状况，但是在河流上游，例如秘鲁，人口密集的地区正在给河流系统增加威胁。
While the Amazon is in generally good shape, in the upstream regions, such as Peru, there are many high density areas of people that inject threat into the system.
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