船体后部 meaning in English

afterbody

When sailing in waves , a part of ship bow will depart from water surface because of the significant heave and pitch ( mostly happened at bow in head seas , and may happened at stern in follow sea ) . when ship enter into water once again , violent impact with waves will happen , which is called slamming
当船舶在波浪中航行时，由于剧烈的垂荡和纵摇，船底的一部分会露出水面(主要是在迎浪时发生在船体前部，但在低速随浪时也可能发生在船体后部) 。