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random  | 
        
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/'rændəm/ a. Syn. haphazard; chance (ngẫu nhiên) without definite purpose, plan, or aim; having no specific pattern He used to get super drunk in random places; I don't know where he is now.  | 
        
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ratio  | 
        
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/'reɪʃɪoʊ/ n. Syn. rate; proportion (tỷ lệ) relation which one quantity or magnitude has to another of the same kind; rate; proportion Men outnumber women here in the ratio of three to one.  | 
        
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react  | 
        
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/ri:'ækt/ v. (phản ứng) act against or in opposition to; show a response or a reaction They react negatively to everything I say, because they don't trust me.  | 
        
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recover  | 
        
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/rɪ'kʌvə(r)/ v. Syn. regain (phục hồi) get or find back; regain a former condition He is very ill and unlikely to recover in this month.  | 
        
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refine  | 
        
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/rɪ'faɪn/ v. Syn. purify (lọc) purify; make more precise; improve They refine many valuable nutrients out of the foods in our modern diet.  | 
        
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region  | 
        
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/'ri:dʒən/ n. (khu vực) province; district; tract; neighborhood; the upper air; sky or heavens; inhabitants of a district All in that region was fire and commotion.  | 
        
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register  | 
        
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/'rɛdʒɪstə(r)/ v. Syn. record (đăng ký) give outward signs of; express; record in writing; enroll as a student New students will have to register is tomorrow before getting their books.  | 
        
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reject  | 
        
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/rɪ'dʒɛkt/ v. Syn. refuse; deny (từ chối) turn down; refuse to accept; dismiss from consideration He would reject the idea of starting a war.  | 
        
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relax  | 
        
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/rɪ'læks/ v. Syn. free; loosen; calm (thư giãn) make less severe or strict; become less tense Our new colleague should relax if he sees that we are a friendly group.  | 
        
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release  | 
        
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/rɪ'li:s/ v. Syn. liberate; freedom (phát hành) give off; liberate; grant freedom to; make something available He wanted to release the list with the names of the prisoners before Monday.  | 
        
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reluctance  | 
        
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/rɪ'lʌktəns/ n. (miễn cưỡng) state of being reluctant; unwillingness; hesitancy in taking some action The main reason for this reluctance is the threat of litigation for defamation.  |