mindmap
root((RE<br>01))
reciprocal
1、 Done, given, or felt equally by both sides.
2、 Related to each other in such a way that one completes the other or is the equal of the other.
🌱They had done us a great favor, so as a reciprocal gesture we invited them for a weekend on the island. 🌳In Latin, *reciprocus* means "returning the same way" or "alternating." So in a *reciprocating engine*, like the one in your car, the pistons move back and forth, and that motion is transformed into the rotary motion of the crankshaft. A *reciprocal* is a pair of numbers （such as 5/6 and 6/5） that can be multiplied to produce 1. *Reciprocity* （with the accent on the third syllable） between two nations means they agree to recognize certain things granted in one country as being valid in the other—for example, your driver's license. rebut 1、 To oppose by argument.
2、 To prove to be wrong.
🌱The claims about receiving payoffs from builders were eventually rebutted by the mayor's office, but the damage had been done. 🌳The *-but* in *rebut* once meant basically "butt," so *rebut*'s original meanings were "to drive or beat back" and "to attack with violent language." *Rebuttals* can still be rather violent, as anyone who has watched some heated moments in a presidential debate can testify. The word is often used by lawyers, since the lawyer for the accused or for the party being sued almost always tries to rebut the charges against his or her client; but it's also used in plenty of contexts outside the courtroom. revoke To officially cancel the power or effect of something （such as a law, order, or privilege）.
🌱His real-estate license had been revoked after his conviction for fraud three years earlier. 🌳Since *vocare* means "to call" in Latin （See VOC,） to revoke is to "call back." Your driver's license could be revoked after about three convictions for driving under the influence of alcohol; some people's licenses are even revoked for life. You could get your passport revoked if a judge thought you had violated the terms of your bail and suspected you might skip the country. And if you're out of prison on probation and violate the terms of probation, it will probably be revoked and you'll end up back in the slammer. regress To return to an earlier and usually worse or less developed condition or state.
🌱In the years since she had left, the country seemed to have regressed badly, and its corruption and dire poverty had gotten much harder to ignore. 🌳As you might guess, *regress* is the opposite of *progress*. So if a disease regresses, that's generally a good thing, but in most other ways we prefer not to regress. If someone's mental state has been improving, we hope he or she won't start to regress; and when a nation's promising educational system begins to regress, that's a bad sign for the country's future. Economists often distinguish between a *progressive* tax and a *regressive* tax; in a progressive tax, the percentage that goes to taxes gets larger as the amount of money being taxed gets larger, while in a regressive tax the percentage gets smaller. （Rich people prefer regressive taxes.）
2、 Related to each other in such a way that one completes the other or is the equal of the other.
🌱They had done us a great favor, so as a reciprocal gesture we invited them for a weekend on the island. 🌳In Latin, *reciprocus* means "returning the same way" or "alternating." So in a *reciprocating engine*, like the one in your car, the pistons move back and forth, and that motion is transformed into the rotary motion of the crankshaft. A *reciprocal* is a pair of numbers （such as 5/6 and 6/5） that can be multiplied to produce 1. *Reciprocity* （with the accent on the third syllable） between two nations means they agree to recognize certain things granted in one country as being valid in the other—for example, your driver's license. rebut 1、 To oppose by argument.
2、 To prove to be wrong.
🌱The claims about receiving payoffs from builders were eventually rebutted by the mayor's office, but the damage had been done. 🌳The *-but* in *rebut* once meant basically "butt," so *rebut*'s original meanings were "to drive or beat back" and "to attack with violent language." *Rebuttals* can still be rather violent, as anyone who has watched some heated moments in a presidential debate can testify. The word is often used by lawyers, since the lawyer for the accused or for the party being sued almost always tries to rebut the charges against his or her client; but it's also used in plenty of contexts outside the courtroom. revoke To officially cancel the power or effect of something （such as a law, order, or privilege）.
🌱His real-estate license had been revoked after his conviction for fraud three years earlier. 🌳Since *vocare* means "to call" in Latin （See VOC,） to revoke is to "call back." Your driver's license could be revoked after about three convictions for driving under the influence of alcohol; some people's licenses are even revoked for life. You could get your passport revoked if a judge thought you had violated the terms of your bail and suspected you might skip the country. And if you're out of prison on probation and violate the terms of probation, it will probably be revoked and you'll end up back in the slammer. regress To return to an earlier and usually worse or less developed condition or state.
🌱In the years since she had left, the country seemed to have regressed badly, and its corruption and dire poverty had gotten much harder to ignore. 🌳As you might guess, *regress* is the opposite of *progress*. So if a disease regresses, that's generally a good thing, but in most other ways we prefer not to regress. If someone's mental state has been improving, we hope he or she won't start to regress; and when a nation's promising educational system begins to regress, that's a bad sign for the country's future. Economists often distinguish between a *progressive* tax and a *regressive* tax; in a progressive tax, the percentage that goes to taxes gets larger as the amount of money being taxed gets larger, while in a regressive tax the percentage gets smaller. （Rich people prefer regressive taxes.）
RE, in its other main sense, means "back" or backward." Since doing something again means going back to it, the two senses are actually related; still, the meaning of re- in most words is pretty clearly one or the other. So a rebound comes back at you; to recall means to "call back" a memory; and to react is to "act back" at someone else's action.🌸