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The body of an animal can be compared to some kind of machine such as a locomotive. In fact, an animal’s body by itself is a machine composed of many components. Each part plays a particular role, and has particular structure making it suits for that role. All parts depend on and cooperate with each other in order to complete the whole work. The loco needs fuels such as coals, woods or other combustive materials. Consumption of these fuels supplies the loco with power and energy. Similarly, the animal’s body needs supply of fuels too. They are called foods which provide animal with energy. In order to oxygenate fuels in the loco as well as foods in the animal’s body, oxygen must be provided. The loco is composed of some special components: furnace where fuels are received and burned, pipes that transport steam, wheels that make the train move, and chimney that drains waste gas. Analogously, the animal’s body is also composed of various components: enteron that intake and digest foods, emunctory that drain out of the waste, veins and arteries that convey oxygen and store blood, as well as legs and wings that help the animal move.              

 

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• 这次行了，之前连着中文一块copy就发不出来，很奇怪 -cutestream- ♀ (0 bytes) () 08/11/2011 postreply 13:42:20