1. A small glandular organ that is situated behind the top of the breastbone, consisting mainly of lymphatic tissue and serving as the site of T cell differentiation. The thymus increases gradually in size and activity until puberty, undergoing involution thereafter. 
   胸腺一种主要由淋巴组织构成的位于胸骨后上部的小腺体，它是t细胞的分化处。在青春期之前胸腺不断变大且渐逐活跃，而后开始退化

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• 1. 内卷
  involute渐开线...involution内卷...Involutisporonites单孔卷曲粉属
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• 2. 退化
  inverted well 补给井...involution 退化...inyoite 板硼石
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• 3. 错综复杂
  involuntary nervous system 不随意性神经系统...involution 错综复杂...involutional depression 更年期忧郁病
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• 4. 对合
  切展线;渐伸线 involute...对合 involution...碘化物 iodide
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