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1144177586丫头
前者是within three days后者可能有2个，分别是in three days(表未来的3天)，after three days(表过去未来的3天)
missohmygod
7天之后:seven days later 或 after seven days 7天之后的下午:the afternoon after seven days 7天之后的晚上:the night after seven days
ansenhachi
a few days ago 或者放句末用 the other day
大哈哈a呦呦
三天之内：within three days三天之后：after three days 或者 in three days
扭扭炒饭
days earlierdays beforedays agothe other day
yk小康哥
Within three days after three days
妞妞们要健康
within three days三天之内in three days三天之后
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