He grew a different crop on the same field five years in a row, what researchers call crop rotation.

他连续5年在同一块地上轮流种植不同作物，研究人员称之为轮作。

《柯林斯英汉双解大词典》

More about curl.If we have a velocity field, then we have seen that the curl measures the rotation affects.

关于旋度的更多介绍，设有一速度场，我们知道旋度是测量旋转影响的。

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In particular, a force field with no curl is a force field that does not generate any rotation motion.

特别地，一个没有旋度的力场，就是一个不产生任何旋转运动的力场。

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Georgetown is the only team in the 68-team field using a six-man rotation.

WSJ: Georgetown: Having a Deep Bench Is Overrated

He knew their sisters, who played rotation basketball at the hoop past left center field. (Well, he knew the sisters by sight: Joe never said five words in a row to anybody's sister.) He knew all their houses, and who slept where.

CNN: Excerpt: 'Joe DiMaggio: The Hero's Life'

Results of the interviews and field surveys suggest, in general, that partners perceive some direct effects of rotation on audit quality.

FORBES: KPMG's Inside Trader: What The Auditor, and Skechers, Don't Want To Talk About