哥伦布发现美洲大陆以后,很多欧洲国家争先恐后地向美洲大陆进军。他们希望把那里变成自己的殖民地,然后抢夺那里的资源和粮食。除了美洲大陆以外,欧洲各强国还向非洲、亚洲派出了军队,想要在全球建立自己的殖民地。因此,在当时,军队乘船出发,经常需要在海上航行好几个月。每当长时间航行的时候,士兵和船员们的身体就会出现异常。他们不想吃东西,而且感到浑身无力。有的人还会出现牙龈出血,甚至开始掉牙。情况更严重的时候,他们会浑身发热,甚至失去生命。但 After Columbus discovered the American continent, many European countries vined to march toward the American continent. They want to turn that there into their own colony, and then rob the resources and food there. In addition to the mainland of the Americas, the major powers in Europe have also sent troops to Africa and Asia and want to establish their own colony around the world. As a result, at that time, the armed forces often set sail for several months at sea. Whenever sailing for a long time, the soldiers and crew members will be abnormal. They do not want to eat and feel weak. Some people will also appear bleeding gums, or even begin to fall. When the situation is more serious, they will feel hot and lose their lives. but