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Between Oregon and Washington is a river named Columbia, after Columbus. In the Columbia River are large fish called salmon. Salmon live in the salt ocean, but when Mrs Salmon wants to lay her eggs she goes way up the Columbia River, far above the falls to fresh water, looking for a quiet place to do so. How can she get by the falls?
2021-09-14(万方平台首次上网日期,不代表论文的发表时间)
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