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  1. Placenta - Wikipedia

  2. Placenta: Overview, Anatomy, Function & Complications - Cleveland Clinic

  3. Placenta: How it works, what's normal - Mayo Clinic

  4. What the Placenta Is and How It Forms During Pregnancy - What to Expect

  5. Placenta | Journal | ScienceDirect.com by Elsevier

  6. Placenta: anatomy and function - Kenhub

  7. The placenta: a multifaceted, transient organ - PMC

  8. Placenta: How it works, what's normal - info.johnsonmemorial.org

  9. 胎盤 - 维基百科,自由的百科全书

  10. Embryology, Placenta - StatPearls - NCBI Bookshelf