Once a week, a maid changes the sheets.

女仆每个星期换一次床单。

《柯林斯英汉双解大词典》

The train operates the 2,400-mile round trip once a week.

这列火车每周进行一次2400英里的往返旅行。

《柯林斯英汉双解大词典》

We tend to meet up for lunch once a week.

我们往往会每周共进一次午餐。

《柯林斯英汉双解大词典》

Women who said they were physically active even once a week showed less cognitive impairment as measured by a test.

VOA: special.2010.07.07

Python You can pick up another language in a week, couple of weeks at most, once you know how to do Python.

只要学会了，你可以在一周之内学会任意一种语言，最多两周。

麻省理工公开课 - 计算机科学及编程导论课程节选

and the last quarter is a seminar in which you only go once a week for three hours

最后一个季度是研讨会，每周只需要参加三个小时，

群集课程 - SpeakingMax英语口语达人

Make a certain time, whether once a week or once a month, to review all of your finances.

FORBES: Ten Tips To Clear Your Portfolio's Dead Weight

This family-oriented site, which combines magazine format with Web flexibility to publish new articles every day instead of once a week or once a month, has unveiled a special Halloween section.

CNN: Halloween spirits are on The Web

For months, Eli Lilly (nasdaq: LLY - news - people) has been quietly giving away a one-month supply of a new version of its Prozac antidepressant that is taken once a week, as opposed to once a day or more.

FORBES: Magazine Article