We tend to meet up for lunch once a week.我们往往每周共进一次午餐。Lung cells die and are replaced about once a week.肺细胞约每周新老更替一次。Meat was available once a week if at all.就算有肉，也是每周才吃一次。...

once a week的音标：once a week的英式发音音标为：[wʌns ə wi:k]once a week的美式发音音标为：[wʌns e wik]...

每星期一次...