How Wolves Change Rivers
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trophic [ˋtrɑfɪk]
adj.營養的;有關營養的
cascade [kæsˋked]
n.[C](陡峭的)小瀑布;(階梯狀)瀑布的一支;瀑布狀的東西;一連串的東西
tumble [ˋtʌmb!]
vi.跌倒;滾下;墜落;被絆倒;被傾覆
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