boat: is sometimes applied generally to all such structures, but more specifically denotes a small, typically open structure operated by oars, paddles, poles, sails, or a motor: took the ~ without any paddles.         oar桨a pole with a flat blade   paddle短浆a short pole with a broad blade   pole杆子a long, slender, rounded piece of wood or metal   sail帆a piece of material extended on a mast to catch the wind   motor马达a machine that supplies motive power    


vessel: suggests chiefly a large seagoing boat used to contain or transport persons or commodities or to serve as a base of operation: a fleet of fishing ~s.   vessel  1、大船轮船a large ship or boat，如ocean-going vessels远洋轮船   2、液体容器a container used for holding liquids, such as a bowl, cup, etc，如a Bronze Age drinking vessel青铜器时代的饮具    3、血管a tube that carries blood through the body，如the doctor said he'd severed a vessel in his leg医生说他割断了腿上一根血管


ship: stresses the navigational aspect of a large seagoing vessel and has connotations of individuality and romance: the beauty of the great sailing ~s.  （navigation  1、导航to plan a route即规划路径，如navigation systems/aids/experts导航系统/器材/专家    2、航行the movement of ships or aircraft指船或飞机移动，如the right of navigation through international waters国际水域航行权，如freedom of navigation航行自由，美国常简称FON）    （romance浪漫有2个意思  1、和爱情相关about love  2、令人兴奋的exciting，如传奇故事、旅游履行    奥黛丽赫本的Roman Holiday罗马假日二者皆有，可能是最romantic的电影）


craft: applies to any boat or ship that plies the water and is often a vague or general term: small ~ darting in all  directions.    ply the water航行于水上，如the ship plies between London and Sydney这船常航行于伦敦与悉尼之间


boat船小船: 有时泛指船舶，但更多指小的敞开的结构体，用浆帆马达等驱动，vessel船舶:  主要表示大型航海船，用作运输或作业平台，ship船舶: 强调能导航能航行的大船，有浪漫个体的意味，craft船: 泛指大小水上船，通用而不明确


记忆方法: 1）首字母BVSC想成伴我上船<==船舶        舶指大船

         2）练习一下

         3）船舶的意思是漂浮水上运输客货的结构mean a floating structure designed to carry persons or goods over water.首字母BVSC想成伴我上船<==船舶舶指大船