once 中文
EN
[wʌn(t)s] [-ʌns] 
US 副一次, 一旦 连一旦, 一经...便
FR once 
- 副词 (Adverb)
- (frequency) One and only one time.
- I have only once eaten pizza.
- (temporal location) Formerly; during some period in the past.
- He was once the most handsome man around. I once had a bicycle just like that one.
- (mathematics) Multiplied by one: indicating that a number is multiplied by one.
- Once three is three.
- As soon as.
- In his submission to the UN, [Christof] Heyns points to the experience of drones. Unmanned aerial vehicles were intended initially only for surveillance, and their use for offensive purposes was prohibited, yet once strategists realised their perceived advantages as a means of carrying out targeted killings, all objections were swept out of the way.
- (frequency) One and only one time.
- 连词 (Conjunction)
- 更多范例
- 用于句中
- 'Oxford's great metaphasiarch', as Punch once called him, was seldom guilty of metaphasis, or the transposition of sounds. What he transposed was ideas.
- He conceded the race once it was clear he could not win.
- To the east the effect of the old buildings looking towards the abbey (see Frontispiece once more) is so fine that little need be done beyond the necessary repair and reharling of these.
- 用于句首
- Once CA analyses were carried out, correlations between source of isolation (birds, mammals, mosquitoes), viremogenic capacity in birds (High and Low) and virulence in mice (High and Low) were tested.
- Once you've submitted a tax return, the Tax Department will assess the amount of tax you still owe.
- Once Melanie had left the house, I entered her bedroom and began to brivet around.
- 用于句尾
- Shiseido Parlor is a storied yoshoku establishment in the heart of Tokyo’s Ginza district, a restaurant to which many Japanese make a pilgrimage at least once.
- The vending machine went wrong and dispensed five cans of drink at once.
- This man is about to die, get him into theater at once!
- 用于句中
Definition of once in English Dictionary
- 词类阶层 (Part-of-Speech Hierarchy)
- 副词
- 时间副词
- 短暂地点副词
- 频率副词
- 短暂地点副词
- 不可比的副词
- 时间副词
- 连词
- 副词
资料来源: 维基词典
在语法上，这个单字"once"是一个副词，更具体地来说，是一个时间副词和一个不可比的副词。它同时也是一个连词。