曾经的例句：Once the page was picked up by search engines, the number of new and one-time visitors increased significantly.一旦该页面被搜索引擎选中，新访问者和曾经的访问者的数量就会显著增加。
一次性的
disposable adj.一次性的，用后可扔掉的例句：Do you often use disposable gloves? 你经常使用一次性手套吗？
two-time
背叛自己的另一半，对爱情不忠例句：I ended the relationship when I found out he was two-timing me.当我发现他脚踏两条船时，就分手了。
in no time
很快，马上，立刻例句：The kids ate their dinner in no time.孩子们很快吃完了饭。
about time
差不多是时候了；早该（做某事）了例句：It is high time for the critics to open their minds to a new approach.是到了批评者们对新做法采取开放态度的时候了。
