one day it started raining
一天，天开始下雨了
以上为机器翻译结果，长、整句建议使用 人工翻译 。
One day it started raining, and it didn't quit for four months.
有一天开始下雨了，然后一直不停的下了四个月。
youdao
One day the family went to see a baseball game of an older brother. It was cloudy and by the time they got to the field it started raining.
一天，一家人去看一个兄长的棒球比赛，天气阴沉，当他们到达赛场的时候开始下雨了。
VOA: standard.other
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