名詞 ans:

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

名詞 an:

1. an associate degree in nursing
   同義詞：Associate in Nursing, AN

1. The 20th century is drawing to an end.
   20世紀即將結(jié)束。
2. The house is at an elevation of 1000 meters.
   這所房子在海拔1000米處。
3. He made an appropriation of USD20,000 for payment of debts.
   他挪用20,000美元還債。
4. The airplane flies at 900 kilometers an hour.
   飛機以每小時900公里的速度飛行。