I go home every fourth week.

我每四个星期回家一次。

youdao

I go to library every fourth week.

我每隔三周去图书馆一次。

youdao

Take a week off every third or fourth week, or go long every fortnight instead.

每三或四个星期进行一次或者双周进行一次长途就足够了。

youdao

Take a week off every third or fourth week, or go long every fortnight instead.

每三或四个星期进行一次或者双周进行一次长途就足够了。

youdao