at once

All at once there was someone knocking on the door.

忽然有人敲门。

I dreamed up a plan to solve both problems at once

我想出了一个方案，可以同时解决两个问题。

I have to go, I really must, at once.

我得走了，我真的必须马上就走。

A computer can perform many tasks at once.

电脑能同时做多项工作。

Please be so kind as to see to it that all the alterations are made at once!

请务必立即执行变更！

We have several projects all on the boil at once.

我们热火朝天地同时上马了几个项目。

He couldn't reasonably be expected to pay back the loan all at once.

公平合理地讲，不可能指望他一下子归还全部借款。

She knew at once that he was concealing something from her.

她马上知道了他有事瞒着她。

You can't be doing two things at once

不能一心二用。

She says she must speak with you at once.

她说她必须立刻跟你谈谈。

I wrote back to Meudon at once to fix up a meeting.

我马上给缪顿回信安排会面。

She fell in with my idea at once.

她立刻同意了我的主意。

It is a physical impossibility to be in two places at once.

同时身处两地在自然法则上是不可能的。

The receptionist recognized him at once.

接待员一眼就认出他了。

The body was too badly decomposed to be identified at once.

尸体严重腐烂，难以马上辨明身份。

'Come here at once!' she ordered.

“马上过来！”她命令道。

He took off at once and headed back to the motel.

他立刻离开，回到汽车旅馆。

Remove from the heat, add the parsley, toss and serve at once.

端离炉子，加上欧芹，颠起翻面后就立刻上桌。

All at once, Mick's serious expression softened into a grin.

米克严肃的表情一下子变成了笑脸。

She seems at once feminine and able to cope in a man's world.

她看起来既有女人味，又能在男人的世界里游刃有余。

You can't be doing two things at once.

不能一心二用。

The boys all began to talk at once.

所有的男孩子们立即说起话来。

I feel terribly sleepy all at once.

我突然觉得特别困。

It's a lot of information to absorb all at once.

要一下子消化这么多资料，真是很难。

The audience at once greeted him warmly.

观众立即对他作出了热情的反应。

The award-winning novelist often has three or four books on the go at once.

那位获奖小说家经常是三四部小说同时写的。

From childhood, he was evidently at once rebellious and precocious.

从儿时起，他就明显地既叛逆又早熟。

If necessary I can come at once.

如果有必要，我可以马上来。

No bank could ever pay off its creditors if they all demanded their money at once

如果所有的储户同时要求提取存款，没有哪家银行能办得到。

I must speak to Tania at once.

我要马上跟塔尼娅讲话。