He comes here every third day.

卡车每隔三天开一次。

It has been snowing, roughly every third day.

近来大约每三天就要下一次雪。

He comes here every three days (every third day).

他每三天来这儿一次。

Sometimes he ate every third day, sometimes only every fifth or sixth day; so he was always hungry, although he worked day and night.

有时候他们每三天，更有时是五天或六天，才有吃一顿，所以总是饥饿，虽然他们日夜工作。

Hundred of years ago, man had a hard life and was never able to get enough to eat. Sometimes he ate every third day, sometimes only every fifth or sixth day;

许多年前，人类生活艰难，从来没有能够吃得饱，有时候，他每隔三天吃一顿，有时却每隔五或六天；