It got colder day by day . | 天一天天变冷了。 | When spring comes , the days get longer day by day . | 春天来了，白天一天天变长。
Day by day he seemed to get better . 他似乎一天天好起来。
She is getting better day by day . 她的情况一天比一天好。
It is getting warmer day by day . 天越来越暖和了。
It is getting warmer and warmer day by day . 天越来越暖和了。
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