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例：lf you divide 26 by 2,the quotient is 13.
例：Raccoons are shy and active only at night.
詞根記憶：rac(e)（種族）+ism（…主義）--種族主義
同根詞：racist(n．種族主義者)
詞根記憶：radi(光線，射線)+ant--發光的--容光煥發的
例：a radiant smile燦爛的笑容
同根詞：radiation(n.發光，傳播)；radiator(n．散熱器)
詞根記憶：radi(光線)+ate--發光，放熱--放射，輻射
例：The national observatory has been observing x-rays radiated by compact stars for years.
派生詞：radiation(n．放射；放射物；放射線)
詞根記憶：radic(根)+aI--根本不講道理的--激進的
例：a radical feminist激進的女權主義者
派生詞：radically( ad.徹底地；激進地)
詞根記憶：radi(輯射：光線)+o+active(活躍的)--發射光活躍的--放射性的
例：Calcium carbonate shells contain radioactive material.
聯想記憶：radio(無線的)+carbon(碳)--不經過實體傳播的碳--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．直徑)；circumference(n．圓周)
例：The radius of the circle is 0.5 meter.
