normal topological space

例句：

1. 1. The normal temperature for a human body is 98.6 degrees Fahrenheit.
   人体正常体温是98.6华氏度。
2. 2.The normal course of the disease was to improve gradually over time.
   这种疾病的正常病程是逐渐改善的。
3. 3. The normal distribution of income shows that everyone has an equal chance of success.
   收入的正常分布表明每个人都有平等的成功机会。