ANS

名词 ans:

1. the part of the nervous system of vertebrates that controls involuntary actions of the smooth muscles and heart and glands
   同义词：autonomic nervous system

名词 an:

1. an associate degree in nursing
   同义词：Associate in Nursing, AN

1. The 20th century is drawing to an end.
   20世纪即将结束。
2. The house is at an elevation of 1000 meters.
   这所房子在海拔1000米处。
3. He made an appropriation of USD20,000 for payment of debts.
   他挪用20,000美元还债。
4. The airplane flies at 900 kilometers an hour.
   飞机以每小时900公里的速度飞行。