| | racket | n. (球拍) device consisting of an oval frame with a tight interlaced network of strings and a handle; wooden paddle, as one used in table tennis
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| radiate | v. Syn. effuse(放射,輻射) spread out; effuse; issue or emerge in rays or waves
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| radical | a. Syn. drastic; extreme(根本的,激進的) drastic; extreme; arising from or going to a root or source; basic
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| radius | n. (半徑,半徑範圍) right line drawn or extending from the center of a circle to the periphery
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| raft | n. (筏,救生艇) a flat float made of logs or planks;  a large number or amount or extent
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| ragged | a. Syn. torn; worn(襤褸的,破爛的) torn; worn; having an irregular surface or edge; uneven or jagged in outline
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| rail | v. Syn. scold; rant(責罵,斥責,咆哮) scold; express objections or criticisms in bitter, harsh, or abusive language
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| ramble | v. Syn. wander(遊蕩,漫無目的遊蕩) wander aimlessly; move about aimlessly; walk about casually or for pleasure
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| rampant | a. Syn. wild; extravagant(猖獗的,滋生的,猛烈的) unrestrained and violent; occurring without restraint
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| ratio | n. Syn. rate; proportion(比,比率,比值) relation which one quantity or magnitude has to another of the same kind; rate; proportion
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| ravage | v. (毀壞,破壞,劫掠,災害) bring heavy destruction on; devastate
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| rave | v. (咆哮) speak wildly, irrationally; speak or write with wild enthusiasm
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| readily | ad. Syn. easily; quickly; promptly(容易地,欣然地,立刻地) easily; quickly; in a prompt, timely manner; promptly
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| reap | v. Syn. gain; harvest; glean(收割,收穫) gain; harvest a crop from; get or derive; obtain as a result of effort
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| reassure | v. (使安心,打消疑慮) give or restore confidence in; cause to feel sure or certain
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| recede | v. (後退,收回(諾言)) move back; retreat; withdraw a claim or pretension
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| recession | n. Syn. withdrawal; retreat(撤退) withdrawal; retreat; time of low economic activity
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| recipient | n. Syn. receiver(接受的東西,容納) receiver; one that receives or is receptive
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| reciprocal | a. Syn. mutual; exchangeable; interacting(互相的,互動的,互惠的) concerning each of two or more persons or things; exchangeable; interacting
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| recital | n. (朗誦,背誦,敘述) detailed account or description of something
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