Nowadays, mobile games tend to lighten the burden on players to prevent them from giving up. At present, crew training is a big problem for players who have less free time. Even some players can't upgrade a big ship to 3 stars in a year. So I thought maybe we could have a building for crew training. The building can accommodate one or more ships. And the crew on this ship automatically add experience. It doesn't take much to generate experience, such as adding 15 points a day. The level of building affects the training duration and experience. I think it's a nice feature for players, especially for busy young people.