三天两头 every two or three days; almost every day; every other day or so
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... every few days 每几天 every two or three days 每两三天 15， participate in 参加；参与 ...
It rains every two or three days.
每隔两三天就下一场雨。
youdao
每隔二三天就下一次雨。
"Because when I played last season, I played once a week." But now I play once every two or three days.
因为上赛季我每周只有一场比赛，而现在两三天就有一场。
He'd make it through a three-hundred-page novel every two or three days.
NPR: Excerpt: 'Then We Came to the End'
While 32, 000 people in a population of 1.5m have no running water, 100, 000 or so get water once in every two or three days.
ECONOMIST: The Gaza Strip: Not nearly back to normal | The
According to Lockheed officials, VentureStar will be able to take cargo into space at a tenth of the current cost, and could be ready to fly every two or three days.
ECONOMIST: The space industry: Vying for stardom | The
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