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n.水槽，食槽；低谷期；[航]深海漕；[气]低气压槽 变形： 复数：troughs 英英释义： trough[ trɔf, trɔ:f ]n.a narrow depression (as in the earth or between ocean waves or in the ocean bed)a channel along the eaves or on the roof; collects and carries away rainwater同义词：guttera concave shape w
