once (EN)

副词，连词

副词 “once”

1. 一次
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   She has visited Paris once in her life.
2. 曾经
   She once lived in Paris before moving to New York.
3. 一次 (从未)
   He didn't look up from his book once during the entire meeting.
4. 一倍
   Once five is five.

连词 “once”

1. 一旦
   Once the rain stops, we can go outside to play.