hull [hʌl]

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n.船身；(果、实等的)外壳；vt.去(谷物等)壳

the body or frame of a ship , most of which goes under the water

The outer surface of ship's hull is very hard. 船体的外表面非常坚硬。
The boat's hull has been staved in by the tremendous seas. 小船壳让巨浪打穿了。