Before there is no trash can, garbage everywhere, people put the rubbish into the bottom of the river.
之前没有垃圾桶，垃圾扔的到处都是，有人把垃圾到清澈见底的小河里。
Bottom ground is land in the floodplain of the Missouri River.
低地指的是指密苏里河滩上的地。
The progress of the river is to go to the bottom, to stay low.
河流的进程取决于河床，保持在低位的河床。
British scientists find the world's sixth-largest river... at the bottom of the SEA.
英国科学家发现世界上第六大河流…在海底。
British scientists find the world's sixth-largest river... at the bottom of the SEA.
英国科学家发现世界上第六大河流…在海底。
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