How did the Chinese use their innovative technology to protect themselves from invasion?

Science in China has a long history and developed quite independently of Western science.Needham (1993) has researched widely on the development of science and technologies in China, the effect of culture, and the transference of these principles, unacknowledged, to the West.The Chinese contribution to Western science is particularly interesting because it serves as a center of controversy about the roots of Western science.
According to traditional Western scientists, the roots of science and the scientific method is in Greece and Greek thought.There is a tendency among scientists to claim that not only modern science, but science in general, was characteristic of European thought.The accompanying argument in that all scientific contributions from non-European civilizations were technology-based, not science-based (Needham, 1993).

Towns and small farms are usually for land, lakes, rivers, and seas.they also produce other food, like crops.it's also where animals are, where we get our meat.large plantations normally have forests, where crops are grown for sale. (similar to farms)plantations have larger fields of crops.our wine, sugar canes, and fruits come from plantations.