回周，拼音huí zhōu，是一个词语，释义为回旋、反复。
蛋黄鸟类或爬行动物蛋内的黄色的、通常是球形的部分，回周包有蛋白，作为哺育幼鸟（仔）的营养物。
The yellow, usually spherical portion of an egg of a bird or reptile, surrounded by the albumen and serving as nutriment for the developing young.
我每隔一周回一次家。
课程助理一周回到课程几个小时，来帮助你们，在上机的时候一对一帮助你们完成这些问题集。
Course assistants returned to the course for a couple of hours a week, to help you, one on one with office hours, with problem sets.
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