Curtis must get chemotherapy once every two weeks for his lung cancer.
柯帝斯因肺癌,每两个礼拜要做一次化疗.
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I go to the library once every two weeks.
我每两周去图书馆一次.
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Our guide said she sees a foreign visitor about once every two weeks.
有位导游说,她每隔两周左右会见到一位外国游客.
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