- at a pinch必要时，如果有必要;
- ask for a ride要求搭便车
- as a last resort万不得已;
- a sum of money一笔钱;钿;款子;款项;
- a must必须的
- a lot非常多;成总儿;
- a hard-won discovery一个来之不易的发现
- a good many很多，许多;
- a good knowledge of很好的知识
- a bundle of一捆
- cut a check切张支票
- come to a solution得出解答;
- call a haltv.停止;
- distinguish a from b区别A和B;
- fly into a temper发脾气， 勃然大怒;
- fix a date for确定一个日期
- good health and a long life健康长寿
- go on a trip旅行;
- give someone a ride搭人人
- get a ride搭车；搭便车；顺道搭车;
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