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. 退化
  inverted well 补给井...involution 退化...inyoite 板硼石
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• 2. 内卷
  involurin 外皮蛋白...involution 内卷...iodimetry 碘量法[用碘滴定的方法；用滴定的方法测量碘]
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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. 卷绕
  involuted 纷乱的...involution 卷绕...involve 牵连
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