Dentists advise you to have your teeth checked every six months.

牙医建议大家每六个月检查一次牙齿。

《牛津词典》

She only sees her parents once every six months.

她每半年才探望一次父母。

《牛津词典》

They came once every six months and lasted a fortnight.

她每六个月来经一次，每次为时两星期。

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She has said that she will not be making a record every six months, so she might as well work with as many experts as she can.

VOA: special.2009.08.14

You're given coupon payments every six months and then, when the bond matures,you get your money back.

每六个月你会收到一次利息,当债券到期,你可以赎回本金

耶鲁公开课 - 金融市场课程节选

The coupon is expressed as an annual amount; you get half of it every six months.

票息是以年为单位计算的,每六个月获得一半

耶鲁公开课 - 金融市场课程节选

Additionally, I have a chest x-ray every six months or so and a yearly CT scan.

FORBES: Physician Organizations Voluntarily Heal Themselves To Save Healthcare Dollars

Issuers must also perform a review every six months on accounts that receive a rate increase.

FORBES: New Credit Card Rules Now in Effect

But Southwest tries not to blitz customers they can't get more than one survey every six months.

WSJ: What United, American, Delta, Southwest, JetBlue, Alaska, Virgin America Airlines Learn From Customer Surveys