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| rift | 
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| n. [lũng] a shallow area in a waterway; break in friendly relations; narrow fissure in a rock Capello believes there will be no long-term rift between the fans and the Manchester United star. | 
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| rigid | 
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| a. [cứng] stiff and unyielding; strict; not flexible Without integration, we are stuck in rigid, inflexible states and face chaotic feelings or thought. | 
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| rigidity | 
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| n. [cứng] stiffness; the physical property of being stiff and resisting bending With such a supple, sensitive, and compassionate mind, rigidity is something you need never worry about. | 
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| rigor | 
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| n. [nghiêm khắc] strictness or severity, as in temperament, action, or judgment; something hard to endure Many settlers could not stand the rigor of the New England winters. | 
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| riot | 
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| n. [chống bạo động] state of disorder involving group violence; rebellion She said her main fear was that she would become the focus of a riot once people knew she was in prison. | 
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| rip | 
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| v. [rip] tear or be torn violently; criticize or abuse forcefully and violently The candidates rip into their opponents, each other mercilessly. | 
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| roam | 
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| v. [đi lang thang] wander; ramble; stroll Sometimes known as Europe's tiger, the continent's only native wild cat does roam Spain, Portugal, and southern France. | 
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| robust | 
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| a. [mạnh mẽ] vigorous; full of health and strength; vigorous Those levels are expected to remain robust this year, said the rating firm, but be somewhat below 2008. | 
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| rod | 
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| n. [thanh] stick; a long thin implement made of metal or wood The curtain rod is hung too low and is the wrong color. | 
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| roost | 
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| n. [ngủ] a place, such as a branch of a tree, where birds rest or sleep I'm surprised that you didn't hear any gobbles from the roost. | 
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| rotation | 
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| n. [luân chuyển] revolution; an act of rotating as if on an axis The rotation of the dancer kept time with the music. | 
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| routine | 
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| n. [thường] unvarying or habitual method of procedure; occurring at fixed times or predictable intervals I believe she was happy in her way: this routine sufficed for her. | 
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| rugged | 
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| a. [chắc chắn] uneven; rough; very difficult At last, he passed the rugged competitive examination. | 
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| ruin | 
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| n. [di tích] a destroyed person, object, or building; debris Thanks to them, a country on the brink of ruin is now stabilizing and showing signs of moving forward. | 
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| rustproof | 
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| a. [rustproof] treated against rusting; resistant to rust, oxidation, and corrosion It was made of rustproof alloy. | 
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| saline | 
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| a. [mặn] salty; containing salt; of or relating to chemical salts You can purchase a saline solution in the drug store. |