是"every three day"还是"every three days"(每三天)

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是"everythreeday"还是"everythreedays"(每三天)是"everythreeday"还是"everythreedays"(每三天)是"everythreeday"还是"eve

是"every three day"还是"every three days"(每三天)
是"every three day"还是"every three days"(每三天)

是"every three day"还是"every three days"(每三天)
应该是days 吧..
两天一上的数词天,就要加s的..
所以正确应该是:every three days(每隔两天,三天一次)

every three days
every third day

every three days每隔三天。
没有every three day这种说法。

every three days

当然是every three days拉,三天一次嘛.day是可数的名词,那3天就要用复数了咯~~~~~