One of the most important reasons is that when people in China go to the west, they prepare relatively complete materials, such as fruits, meat and some vegetables, which are fresh and storable, and there are many kinds of fruits, such as oranges, apples and other foods. If these foods are used, they will provide soldiers with rich nutritional resources and reduce some chances of getting sick at that time.
There is another reason: Compared with Europeans, people in China are healthier or less prone to scurvy. After all, this is also a congenital factor. The differences in people's physical qualities led to such differences at that time. Moreover, at that time, a population chose to go to East China, and some officers and men went to the West with better physical fitness. At that time, Europeans were basically unemployed. Physical fitness also led to the difference in illness ability at that time.
Then there is another most important reason. At that time, China was equipped with some medicines and several excellent doctors when he went to the Western Ocean. This kind of doctors, they have a good advantage in treating this disease, they can treat this disease and prevent this disease for these soldiers in time, so these doctors also played an important role at that time.