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1·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》

2·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》

3·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》

4·I do exercises for legs approximately once a week and most of my leg workouts include ballet movements and yoga stretching.

我大约每星期一次做腿部运动，而且绝大部分的腿部训练包括芭蕾舞步和瑜伽伸展运动。

5·He cleans his car once a week.

他每周洗一次汽车。《牛津词典》

6·He comes to see us once a week.

他每周来看望我们一次。《牛津词典》

7·I do aerobics once a week.

我每周做一次有氧健身运动。《牛津词典》

8·Lung cells die and are replaced about once a week.

肺细胞约每周死亡、更新一次。《柯林斯英汉双解大词典》

9·I fill up the tank with gasoline about once a week.

大约每个星期我加满一箱汽油。《牛津词典》

10·We play it together once a week.

我们每周一起玩一次。