英 [æt wʌns] 美 [æt wʌns]
立刻，现在，马上：表示需要立即采取行动或完成某事；
同时，同时进行
（过时用法）在一组中，一起
without delay or hesitation; with no time intervening
同义词： immediately / instantly / straightaway / straight off / directly / now / right away / forthwith / in real time / like a shot
simultaneously
同义词： at a time / at one time
托福 ... to date到目前为止,迄今 at once马上,立刻 in a hurry匆忙;立即,很快地 ...
... at once 立刻,马上(短语) Chinese 中国的;汉语，中文;中国人 computer studies 计算机课程(短语) ...
... once again再一次;再次;再见钟情;再一遍 at once同时;马上;立即;立刻 at once马上 ...
... past过 at once立即，顿时 American美国人；美国(人)的 ...
马上，立刻
The place at once enraptured me.
这个地方立刻把我迷住了。
If necessary I can come at once.
如果有必要，我可以马上来。
'Come here at once!' she ordered.
“马上过来！”她命令道。
Jurgen Rehm said having one or two drinks a day is not as harmful as having seven drinks at once.
VOA : special.2009.09.08
Well, "The wonder is I didn't see at once" and that is the grave that he has made for their child.
奇迹的是我曾经看不见“,是他为他们的孩子准备的坟墓。
现代诗歌课程节选 : 耶鲁公开课
You can actually initialize multiple things at once by separating them with a comma, and this is sometimes helpful.
你可以一次性初始化很多东西,通过用逗号分开它们，这有时是有用的。
计算机科学课程节选 : 哈佛公开课
That's why I must decide on something at once while there is still time, before I am famous.
VOA : special.2009.09.20
Rod Curtis says that shows the importance of the new vaccine targeting both viruses at once.
VOA : special.2010.01.18
"Don't feel obligated to watch it all at once, " he told the Vulture website.
Thanks to its quick turnaround speeds, the technology also enables scientists to test multiple designs at once.
The liquid hits the back of my throat like an electric shock, at once bitter and sweet.