1. Deposition of pigment by cells. 
   色素沉淀细胞色素的下沉
2. tissue hardened by deposition of lime salts. 
   石灰盐沉积造成的组织硬化。
3. silvery marine variety of brown trout that migrates to fresh water to spawn. 
   身体闪亮的各种褐鳟，游到淡水中产卵。
4. a sedimentary rock formed by the deposition of successive layers of clay. 
   一种由粘土逐层沉积而成的沉积岩。
5. Slow addition to land by deposition of water-borne sediment. 
   冲积层土地因水流所带的沉淀物冲积而扩大

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• 1. 产卵
  depolymerizing enzyme 解聚酶...deposition of spawn 产卵...depot 沉淀物
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