Once you

曾经───once

Hearing that there was an emergency case, the doctor put down his chopsticks and left at once.───听说有急诊, 医生撂下筷子就走.

She told him to leave the room at once.───她要他马上离开房间.

Slavery was once socially sanctioned.───奴隶制曾经为社会所认可.

She guessed the right answer at once.───她立刻猜出了正确的答案.

Once people retire they automatically cease to be union members.───人们一旦退休就自动不再是工会会员.

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.

He once lived in Zambia.───他曾在赞比亚生活过。

If you find anything wrong with the machine, you should put it right at once.───发现机器有故障, 要及时排除.

I want to see her once more.───我打算再见她一次.

I took the hint and left at once.───我领会了暗示立即离开了.

Once bit [bitten] twice shy.

Once on shore, we pray no more.

Once upon a time there was a princess ...

We hang the walls with wallpaper once a year.

Better deny at once than promise long.

He that once deceives is ever suspected.

Hear twice before you speak once.

She determined to go at once.

Measure thrice before you cut once.