What kind of sailboats were there in China during the Eastern Han Dynasty?

In addition, the Han Dynasty had frequent contacts with India, Sri Lanka, Korean Peninsula, Japanese islands and southern countries. Obviously, navigation technology is very important here. China's seagoing ships had stern rudder in the Western Han Dynasty, and the seagoing ships with sails had arrived in the Indian Ocean in the period of Emperor Wu of the Han Dynasty. In the Eastern Han Dynasty, China had a balanced four-cornered sailboat supported by four masts. It can make good use of wind power, and its performance is the first in the world. The new feudal empire, the Han Dynasty, had a strong desire to know the outside world, and the Gobi desert and the ocean on the mainland were within its vision.