有时候一个星期一次。

Sometimes once a week.

youdao

从一月一号开始表白，每隔一个星期一次，到现在，还没成功。

I started to express my love from January 1st, from then on once a week, I still haven't got the girl yet up to now.

youdao

随手清洁的方式已经能够保持你的房子相当干净漂亮了。即使如此，你仍然需要进行一些传统意义上的“大扫除”，最好是一个星期一次。与传统不同的是，它不会花你很长时间。

While clean-as-you-go keeps your house fairly clean throughout the week, you'll still need to do some general cleaning, preferably once a week. But you don't have a lot of time.

youdao