一下子的英文：
in a short while
all at once
all of a sudden

参考例句：

• The axe sliced through the wood.
  斧头一下子把木头劈开了.
• The company was precipitated into ruin when the exchange rate dropped.
  汇率下降时,公司一下子破了产。
• lullaby had the baby into the land of Nod in no time
  催眠曲一下子就把婴儿送入了睡乡。
• I opened the cupboard door and then stood in front of it petrified.
  我打开柜门，站在柜门前一下子惊呆了。
• As the blow still hung impending, I leaped in a trice upon one side
  当打击迫在眉睫时，我一下子就跳到了一边。
• In the Soviet Union, those who once extolled Stalin to the skies have now in one swoop consigned him to purgatory
  苏联过去把斯大林捧得一万丈高的人，现在一下子把他贬到地下九千丈。
• The food being good in the communal dining-room, I polished off in half a jiffy a large plateful of beef and noodle
  公共食堂饭菜好,我一下子就吃了一大盘牛肉炒面。
• He felt he had just been doused in cold water. The barely discernible smile disappeared altogether.
  他觉得好像被人泼了盆冷水，隐约可辨的笑容一下子消失了。
• It would be very unseemly if the corpses had to put on immortality under the gaze of mere sight-seers
  万一游客正在参观的时候，那些木乃伊在他们眼前一下子都进入永生的境界，岂不是很尴尬吗？
• No man ever became thoroughly Bad at once
  没有一个人是一下子就坏透的

short是什么意思：
adj. 短的，矮的，低的；短暂的，短期的；短缺的；缩写的；简慢无礼的；暴躁的
adv. 突然，唐突地；不足
n. 短裤；短路；缺乏

• short cataloging
  简化编目
• The trouble be that we be short of hand.
  困难是我们缺少人手。
• The horse stopped short at the fence.
  马跑到篱笆处突然停了下来。

all是什么意思：
adj. 一切的，所有的；整个的；各种的
pron. 一切；全部；大家，全体
n. 全部财产；所有一切
adv. 完全地；极其

• The policy of burn all,kill all,loot all
  三光政策
• It is all on the house.
  费用全由敝店支付。
• (all) in a twitter
  (极度) 紧张[兴奋],激动

once是什么意思：
adv. 一次，一回；一度；曾经
conj. 一旦；一…就…
n. 一次；一回

• Once is no custom
  一次不成例
• Do it for this once.
  就干这一次吧。
• Gordon is at once modest and clever.(at once …and…既..又)
  戈登既聪明又谦逊