once

• She once ruled over a vast empire .
  她曾统治过一个版图辽阔的帝国。
• The situation flashed on carrie at once .
  嘉莉立即明白了实际情况。
• The matter is pressing and must be dealt with at once .
  必须立即处理。
• Life at the well became normal once again .
  泉畔的生命又恢复常态。
• All at once thunder and lighting began .
  眨眼间，传来霹雳和闪电。
• Once again he has broken his faith with them .
  他又一次对他们不守信义。
• Amanda is home from college once again .
  阿曼达又从学校回到家中。
• You must tell him , and that at once .
  你必须告诉他，而且要立刻告诉他。
• I couldn't once understand what they meant .
  我完全不能理解他们的意思。
• The dustman collects the rubbish once a week .
  垃圾工每周运走一次垃圾。