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例：A sparrow roosted in the small tree.
词根记忆：rot(旋转)+ate(使…)--旋转
例：A circular rim is rotating 300 times per second.//rotate the crops轮种庄稼
派生词：rotation(n．旋转)
词根记忆：来自rotation(n．旋转，回转)
例：Outside the nucleus the rotational velocity would decrease geometrically with distance from the center.
同根词：rotatable(a．可旋转的；可循环的)
词根记忆：来自rough(a．粗暴的)
例：Total dollar sales for each of the company's divisions have remained roughly constant.
5.round v.四舍五入(to express as a round number);完成(to bring to completion);a.圆的(circular);n．圆(circle)
例：When the decimal is rounded to the nearest hundredth, 3.24 is the result.
词根记忆：来自royal(a．皇室的)
例：Faculty members should retain the royalties from books and articles they write.
同根词：royalist(n.保皇主义者；a．保皇的)
例：Mary turned the rudder sharply to avoid hitting the rock.
词根记忆：rudi(无知的，粗鲁的)+ment+ary--无知状态--初步的
例：Technology for tabulating census information was rudimentary during the first half of the 19th century.
同根词：erudite(a．深奥的)
例：The floor is covered by a rug.
