vanish的语气强,指完全、往往是神秘而突然的消失,不留任何蛛丝马迹.而disappear是指消失,完全客观的现象,没有前者语气强烈.
disappear v.消失,不见；灭绝,不复存在.是个一般用语.
The little dog was just there,then he disappeared.那条小狗刚才就在那里,然后就不见了.
vanish v.消失,不见,指突然间化为乌有,强调非常彻底地、神秘莫测地消失、失踪.
The man ran into the shop and vanished from sight.那个男子跑到了商店里,然后就消失了.