因为是两周一次，用once every other week（每隔一周一次）或once every two weeks（两周一次）都可以，意思一样，但已前者较好。
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... twice 两次 three times 三次 four times 四次 once every two weeks 每两周一次 once upon a time 从前 ...
He will visit once every two weeks to see how his new employees are progressing.
他将每两周视察一次以看看他的新雇员们进展如何。
《柯林斯英汉双解大词典》
Plan your shopping for a couple hours once every two weeks.
计划好你要买的东西，每隔两周去购物一次。
youdao
Ido the towels and sheets once every two weeks, in an extra load.
我每两周洗一次毛巾和床单被罩，这算是额外的工作量吧。
So if you go once a week now, you're only going once every two weeks.
WHITEHOUSE: Press Briefing by Deputy Press Secretary Josh Earnest
Kastelein says it's possible the drug might work if given once every two weeks or even once a month.
FORBES: Magazine Article
Now people have it once a month or even once every two weeks.
BBC: A gin and tonic is no longer up-to-date malaria protection
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