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verysoon,itsbodywasdraggedbythekillersdownintothedepthsofthesea.句中thedepthsof的depth为什么加S?

题目详情
very soon, its body was dragged by the killers down into the depths of the sea.句中the depths of的
depth为什么加S?
▼优质解答
答案和解析
depth加S为名词 深处,深渊的意思