at once

• It is imperative that we should act at once .
  我们必须马上行动。
• All at once he seemed to lose control of himself .
  他仿佛下子沉不住气了。
• She figured the whole scheme at once .
  她立刻就懂得了整个计划。
• He noticed at once that discipline was slack .
  他马上觉察到敌方纪律松弛。
• The ogre did not at once retort .
  “吃人精”当时没有立即吭声。
• The meeting hall was seething at once .
  会场上顿时沸腾起来了。
• We advise that steps be taken at once .
  我们建议立即采取措施。
• It was judged better to set out at once .
  认为立刻出发比较好。
• Aileen began at once to unburden her feelings .
  爱玲立刻开始发泄她的感情。
• His story was seen through at once .
  他的谣言一下就被识破了。