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n.旋转；循环，轮流
1、rotations───n.旋转；循环（rotation的复数）
2、foetation───胎儿
3、flotation───n.浮选（等于floatation）
4、potation───n.喝；饮料
5、notation───n.符号；乐谱；注释；记号法
6、hortation───n.奖励；劝告
7、dotation───n.赠与，给与
8、corotation───n.共转，顺转
9、rotational───adj.转动的；回转的；轮流的
1、Wheat, maize and sugar beet are planted in rotation.───小麦、玉米和甜菜是轮流种植的。
2、A 59-year-old-man visited the neurological outpatient clinic because of a leftward rotation of his head for the last 8 months.───一位59岁的人访问了神经科门诊诊所因为向左旋转他的头部在过去8个月。
3、has been complaining about the lack of effort from his team lately, maybe he needs to send a bit of a message to the rotation players?───秃子总是抱怨自己的球员没有进取精神，是不是他需要对轮换球员表达个什么信息？
4、One of the authors, Mara Cameran of Bocconi University, found that mandatory rotation tends to worsen audit quality.───研究报告的一位作者，来自博可尼大学的玛拉•卡梅伦指出法定的强制更换会恶化审计质量。
5、The committee is chaired by all the members in rotation.───委员会由所有成员轮流主持。
6、The experimental results demonstrate that this method is invariant to rotation without relying on the center of the fingerprint.───实验结果表明，该算法不依赖指纹的中心点，具有旋转不变性。
7、The workers in this workshop do day and night shifts in weekly rotation.───这个车间的工人上白班和上夜班每周轮换一次。
8、When the chanting stopped there was a stillness as though the very earth had stopped in its rotation.───当唱诵结束的时候，有一种寂静，就好像地球本身已经停止了转动。
9、Each rotation has different time commitments but many rotations require overnight shifts and up to 80 hours a week of being in the hospital.───每一次的学习轮换所需要的时间是不同的，但许多的学习轮换都需要值夜班，累计算起来每周在医院至少要待上80个小时。
1、Crop rotation helps prevent soil erosion.