乳恒牙替换是动物牙齿及颌面部生长发育的重要阶段，包含有乳牙根、牙槽骨的吸收、恒牙胚的发育和恒牙萌出等一系列复杂的生理过程。
The replacement of primary and permanent teeth is an important part that belongs to the growth and development of animals' teeth and maxillofacial region.
本书为《经典名著快车道》系列丛书之一。《鲁宾逊漂流记》与1719年首次出版发行，该小说的创作灵感来源于一个真实的故事：一个苏格兰水手在海上与船长发生争吵，被船长遗弃在一座荒岛上。
"Robinson Crusoe", first published in 1719, is based on the true story of a Scotsman who was left on a desert island after a quarrel with the captain of his ship.
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