| 词汇 | ratchet |
| 释义 | ratchet noun[ C ] uk /ˈrætʃ.ɪt/ us /ˈrætʃ.ɪt/ ratchetnoun[C] (DEVICE)a part of a machine that allows movement in one direction only. It is usually a wheel with teeth-like parts that either slide over or lock against the free end of a bar: 棘轮，棘齿 The ratchet at the other end of the axle only turns one way. Keep the ratchet mechanism lubricated with oil. Kypros/Moment/GettyImages (alsoratchet wrench) a tool consisting of a metal handle and a socket, used for turning objects in one direction only: The bolts can be removed with a ratchet. I had almost every ratchet and wrench in the tool catalogue at my disposal. bbeltman/iStock/Getty Images Plus/GettyImages Most handbrakes need about four clicks on the ratchet -if yours takes much more, a garage should adjust it. Catapults were loaded and cocked by means of large wheels with ratchets. Walnut leaves have a jagged sawtooth edge rather like a ratchet. the ratchets of a deckchair Machines - parts air compressor air filter air hose axle coaster brake collector plate console guard inlet instrumentation manifold mechanism pivot rack rack and pinion slide slider soft key spline stepney You can also find related words, phrases, and synonyms in the topics: Tools in general ratchetnoun[C] (NOISE-MAKER)US(alsorattle) a wooden device that when turned around and around produces a noise like a series of knocks Floortje/iStock/Getty Images Plus/GettyImages Toys & dolls balloon beach ball bucket and spade chew toy cuddly toy doll's house fidget fidget spinner finger puppet marble marionette pinwheel puppetry rag doll Russian doll slap bracelet slime snow globe Soft Stuff stuffed animal ratchetnoun[C] (SITUATION)something that makes a situation change or develop in one direction only, for example by being able to rise but not fall or the other way round: Presidential power often acts like a one-way ratchet: It can be increased far more easily than it can be reduced. A price ratchet means that prices do not move downward but are free to move up. Not able to be changed be no hard and fast rulesidiom burn your boats/bridgesidiom congenital continuity deep-seated incorrigible incurably inelastic inelasticity inflexible irreversible irreversibly irrevocable irrevocably leopard unalterable unchangeable uncompromising uncompromisingly unredeemable ratchet | American Dictionaryratchet verb[ I/T ] us/ˈrætʃ·ɪt/ to change an activity, amount, or feeling by degrees: [ I ]Interest rates always ratchet down in an election year. [ M ]Critics are trying to ratchet up public pressure on lawmakers. ratchet | Business Englishratchet noun[ C ] uk /ˈrætʃɪt/us FINANCE, STOCK MARKET an arrangement by which managers are given increasing numbers of shares in a company in relation to increases in its profits or success: The sale has been rewarding for the chief executive, whose original 20% stake grew to 30% under a ratchet arrangement. PRODUCTION a part of a machine that allows controlled movement in one direction only a system that controls activity: Tightening the interest-rate ratchet to control inflation would risk tipping the economy into a nasty downturn. Examples of ratchetratchet A popular explanation holds that large green jurisdictions have been forcing their trading partners to trade or ratchet up their regulation. We also examine the rate of the ratchet when there are two classes of mutation of similar but unequal effects on fitness. Increased dominance also, of course, reduces the rate of the ratchet, because selection reduces the frequency of mutations even when they are heterozygous. For each mean incoming s the region above the triangles will have a drive to the ratchet. The translocation involves a ' ratchet-like ' rotation of the small subunit with respect to the large subunit. The rate of the ratchet is the reciprocal of this time. Although increasing migration does slow the ratchet down, its speed is always higher in the structured population, for all values of m tested. The same will be true if the ratchet has advanced sufficiently far that a substantial proportion of loci are fixed within haploid sets. We have introduced in our random-network model these events in order to assess how important extinction is for the speed of the ratchet. If this least-loaded class is lost in the whole population, a click of the ratchet is recorded. All other parameters act only as scaling factors and do not influence the operation of the ratchet. This is described as a ' ratchet ' process because only back-mutation can reverse it. Medical cost control has followed a ratchet-like pattern quite different from the zigzag of change and reversal seen in some other areas of health policy. The figure shows large populations needing a mutation rate only slightly larger than the mean incoming s to ensure a drive to the ratchet. Self-correcting spontaneous economic impulses were suspended causing a 'ratchet effect' that pushed upwards the equilibrium unemployment rate. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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