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Sorry,there is not text temporarily, Please help tingroom to look for it! 如果您能找到更好的听力原文，请发贴到 听力原文收集区 ，您将会获得10到30积分的 奖励! Thank you！

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Morphogenesis - the process in which tissue shapes and organ structures are developed during embryology. Morphogenic fieled - an environment in which the shape or pattern of a developing organ is dete

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Saturated solutions - Salts such as the apatites do not readily become ionized and dissolve in water. When no more ions can dissolve the solution is said to be saturated. The concentration of ions in

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Stem cells - cells from which a number of more Stimulated saliva - saliva which has been stimulated by chewing. Stippled - a pattern which is made of small dots. Gingiva has a stippled appearance due

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