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- The British once commanded me seas. 英国人曾经控制着海洋。
- The British once commanded the seas. 英国人曾控制过这海域。
- The British once commanded me seas . 英国人曾经控制着海洋。
- It is necessary that he be sent there at once. 有必要马上派他到那里去。
- She writes to her parents once a week. 她每周给父母写一封信。
- Where once commanders had to bark out orders across small battlefields and men advanced shoulder-to-shoulder, modern commanders collaborate over a network, and joint forces synchronize lethal effects from distributed locations. 以前的指挥官通过吼叫在一个小型战场上传递命令战士肩并肩前进，现在的指挥官通过网络协同联合作战部队从分散的位置形成致命的打击效果。
- Soviet tankers' training was not entirely satisfactory, to say nothing of the Spaniard's training, and Arman noted that crews seldom showed any initiative once commanders were lost. 苏联坦克兵的训练并不完全令人满意，更不用说西班牙人了，而且阿尔曼注意到一旦失去指挥员，乘员们很少表现出主动性。
- More than once I've felt my heart slip a cog. 我不止一次感到心脏突然停跳一下。
- My inn had once been a part of an ancient ecclesiastical house. 我的客栈曾经是一个古老教会的房子的一部分。
- He and I were shipmates on a trawler once. 我与他一度同在一艘拖网船上工作。
- It was once thought unmanly not to drink and smoke. 身为男子不抽烟不喝酒曾视为无男子气概。
- The flue should draw better once it's been swept. 烟道一经清扫，通风情况应好些。
- You'll like her once you get to know her. 你一旦了解她，就喜欢她了。
- He likes to hit the bottle once in a while. 他喜欢偶尔喝得酩酊大醉。
- She looked in on us [at our office]once in a while. 每隔些时候，她都到我们这儿[办公室]来一趟。
- I've decided to break with Silvia once and for all. 我决定同西尔维亚彻底绝交。
- Once I took a wife I should have to put down roots. 我一旦娶了老婆，就该过安定的生活了。
- Barry only visits his parents once in a blue moon. 巴里很难得去看望他父母一次。
- The leap year comes around once in four years. 每四年有一个闰年。
- Such evil practice cannot be swept away at once. 这种坏事不是一下能扫除干净的。
