Once or twice a week the changes can be incorporated into the document and a new one printed.

一周一次或两次将更改合并到文档中和新的印刷文档中。

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If they do drink, however, they are advised to drink only one to two units once or twice a week.

即使饮酒，也应每周一次或两次，每次一至两杯。

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Considering their time, people can do exercise after work or after school even one or twice a week.

考虑到时间问题，他们可以在下班后或放学后去锻炼甚至一周锻炼两次。

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Nineteen per cent - which would equate to over 7.5 million people - eat ready meals once or twice a week, and 2% (almost one million) eat them every day.

BBC: NEWS | Health | Cholesterol confusion revealed

One explanation for the benefit in the last study is that patients who came in once or twice a week for Natrecor infusions got better care and felt better emotionally because they were seeing the doctor more often.

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