时间：2011-02-23 15:18来源：蓝天飞行翻译 作者：航空 点击：次
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impairment /.mpe.m.nt/ noun a lessening of effectiveness . De-icing equipment is used to prevent impair-ment of the lifting surfaces through ice formation. impart /.mpɑt/ verb to give, to pass on . A rotating propeller imparts rear-ward motion to a mass of air. impedance /.mpid(.)ns/ noun total electrical resistance to current flow in an alternating current circuit . Imped- ance will vary with changes in fre-quency. impede /.mpid/ verb to hinder or obstruct progress . Hills and mountains impede the horizontal flow of air. impeller /.mpel./ noun a rotor used to force a fluid in a particular direction importance /.mp.t(.)ns/ noun sig-nificance, strong effect or influence . Upper winds are of great importance in meteorology. (NOTE: The expressions of fundamental importance, of great importance, of prime importance, of utmost importance, of vital impor-tance all mean very important.) import duty /.mp.t djuti/ noun payment made to a government on par-ticular goods imported or exported . the duty payable on a carton of cigarettes Also called customs duty, duty impose /.mp.υz/ verb 1. to force something upon a person or thing . The trimmer is used to ease the loads imposed on the flying controls during flight. 2. . to impose a fine to require somebody to pay a sum of money as punishment . to impose restrictions to place limitations on somebody’s actions improve /.mpruv/ verb to make or become better . Turbochargers improve aircraft performance. . The trainee’s flying skills improved a lot in a short period of time. improvement /.mpruvm.nt/ noun the process of becoming better, or something that makes a thing better . An improvement in weather conditions enabled the flight to depart. impulse /.mpls/ noun a force of short duration . A magneto is designed to produce electrical impulses one after another at precise intervals, so that each separate impulse can be used to provide a spark at a spark plug. impulse magneto /.mpls m nit.υ/ noun a magneto with a mecha-nism to give a sudden rotation and thus produce a strong spark inability /.n.b.l.ti/ noun the fact of being unable to do something inactive /.nkt.v/ adjective not switched on, in a passive state . At the
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