名詞 at:

1. a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
   同義詞：astatine, At, atomic number 85
2. 100 at equal 1 kip in Laos
   同義詞：at

1. They estimated the number of visitors at 10 million.
   他們估計參觀者人數(shù)為1000萬。
2. He computed his losses at USD5,000.
   他估計自己損失5000美元。
3. The tariff at the hotel ranges from 20 dollars to 50 dollars a day for a single room.
   旅館的單人房間的價錢每天從20美元到50美元不等。
4. The video is programmed to switch on at ten o'clock.
   電視機設定在10點鐘自動打開。