请注意every作“每、每隔”的用法:every three days(每三天); every third day(每逢第三天); every few days(每隔几天)。 7.
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every two or three days 三天两头 ; 每两三天
I go shopping every three days.
我每隔三天购物一次。
每三天我去那里一次。
You can water the flowers every three days.
你可以每三天给花浇一次水。
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