He altered his face all at once.

他突然变脸。

Get him on the blower at once!

马上打个电话给他！

All at once it began to rain.

突然间下起雨来。

The doctor decided to operate at once.

医生决定动手术。

He figured the whole scheme at once.

他马上就懂得整个计划。

I advise you to own up at once.

我劝你白。

She is hellbent on starting it at once.

她不顾一切地要开始这件事。

The president fastened on the idea at once.

总统拿定这个主意。

He lacked the agility to righten himself at once.

他缺乏恢复正常的机敏性。

It is expedient that he should retire at once.

他最好还退休。

I took the hint and left at once.

我领会暗示离开。

I can't be in two places at once.

我不能同时在两个地方。

Regarding John, I will write to him at once.

至于约翰, 我将给他写信。

They set off at once along the lane in pursuit.

他们出发沿着小巷追赶。

Mistakes in the printing should be pointed out at once.

印刷上的错误应予以指出。

As regards John, I will write to him at once.

至于约翰, 我会给他去信。

As regards Luther,I will write to him at once.

至于卢瑟,我会给他去信。

The committee judged it better to start the work at once.

委员会认为最好开始这项工作。

I don't want ifs and buts; swallow your medicine at once.

我可不听你泡蘑菇, 马上吞下你的药。

I don't want any ifs and buts; do it at once.

"我不想听任何要推延的理由,干吧。"