这就意味着，一旦病人被诊断患有这种癌症，在余下的生命中，他就不得不接受每三个月一次的检查。

This means that, once diagnosed as having it, a patient is well advised to present himself for a check-up every three months for the rest of his life.

youdao

每三个月查一次表。

Meter readings are taken every three months.

《牛津词典》

你需要每三个月就换一次洗发水吗？

Do you need to change your shampoo every three months?

youdao