Lack of exercise is also an issue. Less than 1% of young people work out once a week.

缺乏锻炼也是原因之一，年轻人每周锻炼1次的不足1%。

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Lack of exercise is also an issue. Less than 1 percent of young people work out once a week.

缺乏锻炼也是原因之一，年轻人每周锻炼1次的不足1%。

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Once you understand the mathematics of debt you can work your way out of it.

一旦你理解了债务的数学计算，你就能解决它。

《柯林斯英汉双解大词典》

In the wacky world of quantum physics, however, it is not always impossible to work out what a particle once was but no longer is.

ECONOMIST: The arrow of time

She said there could be an increase in smoke levels while the work is carried out but, once completed, the fire will be completely extinguished.

BBC: Beenham compost fire: Legal notice served on company

Once out of work, German workers have little incentive to seek new jobs: jobless benefits are over-generous and income-tax rates are far too high.

ECONOMIST: Wirtschaftsblunder