Human tooth development is a consecutive process, which includes bud stage, cap stage, bell stage and tooth root development.
人类牙齿发育是一个连续的过程，经历了蕾状期、帽状期、钟状期和牙根发育期。
In this case the cells were taken from what is known as the tooth germ, the little bud that appears before an animal grows a tooth.
在这一研究中，这些细胞来源于所谓的牙胚即动物出牙前发生的幼芽。
Human tooth development is a reciprocal and consecutive process, which includes bud, cap, bell stages, tooth root development and tooth eruption.
人类牙齿的发育，经历蕾状期、帽状期、钟状期、牙根发育和牙齿萌出期。
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