1. The ostrich cannot fly. 
   鸵鸟不能飞。
2. Of, relating to, or involving pepsin. 
   属于、关于或包括胃蛋白酶的
3. The inactive precursor to pepsin, formed in the cells of the mucous membrane of the stomach and converted to pepsin by hydrochloric acid during digestion. 
   胃蛋白酶原胃蛋白酶的一种不活跃原，在胃粘膜细胞中形成并在消化的过程中通过盐酸转化为胃蛋白酶
4. This ostrich policy was brought into derision. 
   这种鸵鸟政策受到嘲笑。
5. The ostrich grows to a height of eight feet. 
   驼鸟长成八尺高。

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