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【丁莉和熟齡的你聊聊天ep.789】我在長江上(七)

上午,過了葛洲壩, 晚上,過長江大壩,一共有五層閘室,每層落差二十多米,船身進入閘室,水漸升高至第二層,閘門打開,就順利升上一級,共五級,每級約需四十五分鐘,工程浩大,因工程造成130萬居民遷居….

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