单词：once and again
一而再, 再三
once and again的用法和样例：
例句
- His mind sagged round and round on the same track.他的念头一而再再而三地在一条轨道上转着。
- Surfers can line up again and again to block the ferry and other harbingers of the future.But change is as inevitable as the tide.冲浪者纵然可以一而再，再而三地排队阻拦客轮和其它将来会出现的入侵者，但夏威夷的变革如同它的海潮一样，无可回避。
- We will consider the problem over and over again.这个问题我们还需再三斟酌。
- I've had to chase the Gas Company up again about the cooker.我不得不再三要求煤气公司派人来修理煤气炉。