• 1. development of the teeth: 牙的发生
• 2. the development of teeth: 牙齿发育

• 1.They say breast milk is the best food for the healthy development of the teeth.
  他们声称母乳是对健康牙齿成长的最好食品。
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• 2.The normal development of the teeth and jaws may be affected by the way that a child sleeps.
  孩子们牙齿和颌部的正常发育可能因睡眠的姿势而受到影响。
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• 3.Witness child development milestones and enjoy the unique ability of early childhood educators to explore the world with the children - from first toys to first lost teeth.
  见证儿童成长每一个关键的脚印，享受儿童专家特有的能力去探索儿童的世界，从孩子的一个玩具到他们长出的第一颗牙齿。
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