翻譯練習--感謝托馬斯小火車的故事和我的專業！

Animals and machines

 

Animal bodies are quiet comparable to certain machines such as train engines. In fact, an animal body itself is a machine. It is a machine with many parts. Each part has its unique function, enabled by its specific structure. All parts are dependent to and coordinative with one another in order to accomplish the whole task of the machine.  Train engines need fuels such as coal, wood and other combustible materials.  Fuel consumption supplies the machine with power or energy. Animal bodies have to be replenished with fuels as well, so called food, offering energy to the animals. Oxygen is a must to burn the fuels in train engines and to oxidize food in animal bodies. Train engines are assembled with special components; the boiler for receiving and burning the fuels, the pipes for delivering steam, the wheels for running the engine and the chimney for letting out the waste gas. Similarly, animal bodies are composed of many parts: the GI tract for food ingestion and absorption, the excretion system for waste disposal, the arteries and veins for blood circulation to deliver oxygen and to maintain nutrition homeostasis, as well as the legs and wings for locomotion.