有三个传教士和三个野人一起来到河边准备渡河，河边有一条空船，且传教士和野人都会划船，但每次最多可供两人乘渡。河的任何一岸以及船上一旦出现野人人数超过传教士人数，野人就会把传教士吃掉。为完全地渡河，传教士应如何规划渡河方案？-There are three missionaries and three savages came to the river ready to cross the river , the river there is a paradise , and the missi