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今天我們要學的詞是 erosion。Erosion 的意思是侵蝕、腐蝕。A new high-speed rail station linking Hong Kong and mainland China opened under Beijing authority, raising new worries among Hong Kong residents of a further erosion of the territory's autonomy，連接香港與中國大陸的高鐵在香港境內的高鐵站啟用，但受北京當局管轄，引起香港居民對自治權進一步受到侵蝕的擔憂。A study last year concluded sediment from erosion following fires would more than double by 2050 for about a third of western watersheds，去年的一項研究表明，火災后地表侵蝕的沉積物在2050年前將在大約三分之一美國西部水域增加一倍以上。
