Final answer:
The ships mentioned in the provided information were built at a shipyard near Nanking. These ships were large in size and were primarily built for military personnel transport. They were adorned with carved dragon eyes on the prows to scare away evil spirits.
Step-by-step explanation:
The ships mentioned in the provided information were built at a shipyard near Nanking. This shipyard alone constructed around 2,000 vessels, including nearly a hundred large treasure ships. The large Chinese ships were primarily built for military personnel transport and were massive in size, with a length of approximately 400 feet and a width of almost 200 feet. They were decorated with carved dragon eyes on the prows to ward off evil spirits.