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例：lf you divide 26 by 2,the quotient is 13.
例：Raccoons are shy and active only at night.
词根记忆：rac(e)（种族）+ism（…主义）--种族主义
同根词：racist(n．种族主义者)
词根记忆：radi(光线，射线)+ant--发光的--容光焕发的
例：a radiant smile灿烂的笑容
同根词：radiation(n.发光，传播)；radiator(n．散热器)
词根记忆：radi(光线)+ate--发光，放热--放射，辐射
例：The national observatory has been observing x-rays radiated by compact stars for years.
派生词：radiation(n．放射；放射物；放射线)
词根记忆：radic(根)+aI--根本不讲道理的--激进的
例：a radical feminist激进的女权主义者
派生词：radically( ad.彻底地；激进地)
词根记忆：radi(辑射：光线)+o+active(活跃的)--发射光活跃的--放射性的
例：Calcium carbonate shells contain radioactive material.
联想记忆：radio(无线的)+carbon(碳)--不经过实体传播的碳--放射性碳
例：Using new radiocarbon dating techniques, it was determined that the charcoal from the Colorado site was at least 11,400 years old.
注意：diameter(n．直径)；circumference(n．圆周)
例：The radius of the circle is 0.5 meter.
