評論
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詞根記憶：來自rigor(n．嚴酷，嚴格)
例：Historians began to apply less rigorous scientific research criteria to the study of women's history.
派生詞：rigorously( ad.嚴厲地)
例：circular rim輪輞
聯想記憶：rin(=rain下雨)+se--雨水沖刷著地面沖洗
例:Tom rinsed his toothbrushes in the cold water.
聯想記憶：謎語( riddle)變dd為pp--波紋(ripple)
例：：The rain rippled the surface of the lake.//The lake was covered with small ripples.
例：Many rituals rise from mythical beliefs.//In the Western Zhou Dynasty only emperors were allowed to perform the ritual worship of heaven.
聯想記憶：對手( rival)隔河(river)相望，分外眼紅
例：The boxer vowed to beat any rival who challenged him.//It promotes healthy competition between rival industries.//Anne's paintings rival the ones I see in art galleries.
派生詞：rivalry(n．競爭；敵對)
詞根記憶：來自rival(n．對手；競爭)
例：Within the boundaries of artistic rivalry lies a sense of family: the shared genetic inheritance, or accident, that enables musicians to make music.
派生詞：rivalrous(a．敵對性的；有競爭性的)
聯想記憶：中國的“樂百氏”(Robust)礦泉水就是這個單詞
例：A large rise in the number of houses starting in the coming year should boost new construction dollars by several billion dollars, making the construction industry's economic health much more robust than it was five years ago.
詞根記憶：rod(咬)+ent--喜歡咬的動物--嚙齒類動物
例:In some cities, recyclable trash is allowed to accumulate to attract rodents.
同根詞：erode(v.侵蝕)；corrode(v.腐蝕)
