1.isotope n.同位素(两个或更多具有相同原子序数却具有不同的质量数的原子中的一个)(one of two or more atomic number but different mass numbers)
词根记忆:iso(等,同)+tope--同位素
例:heavy isotope重同位素
派生词:isotopic(a.同位素的)
2.jeopardize v.危及,危害(to expose to danger or risk)
词根记忆:jeopard (危险)+ize--使处于危险中--危及,危害
例:If too little attention is given to basic research today, future technological advancement will be jeopardized.
派生词:jeopardy(n.危险,危害)
3.judicial a.司法的(of, relating to, or proper to courts of law or to the administration of justice);公正的(just)
词根记忆:judic(评判,法律)+ial--司法的;公正的
例:judicial rules司法规定
4.jumbo a.巨大的(unusually large)
联想记忆:本是一头大象的名字,代指“体大而笨拙的人”,作形容词用时意为“巨大的”
例:The development of a new jumbo rocket is expected to carry the U.S. into its next phase of space exploration.
5.jurisdiction n.管辖权(authority or control);管辖区域(the limits within which authority may be exercised)
词根记忆:juris(=jury法律)+dict(命令)+ion--按照法律享有命令权--管辖权
例:These islands are under U.S. jurisdiction. //One state adds a 7 percent sales tax to the price of most products purchased within its jurisdiction.
6.juror n.陪审团成员(a member of a jury)
词根记忆:jur(评判,法律)+or--按照法律评判的人--陪审团成员
例:Civil trials often involve great complexities that are beyond the capacities of jurors to understand.
7.justify v.证明…正当或有理(to prove or show to be just, right, or reasonable)
词根记忆:just(正义)+ify(使…)叶证明…正当(或有理)
例:Companies are never justified in employing young children, even if the childs family would benefit from the income.
派生词:justification(n.正当理由:辩护):justifiably(ad.有理由地):unjustified(a.未被证明正确的)
8.juvenile a.青少年的(youthful)
词根记忆:juven(年青)+ile --青少年的
例:Juvenile delinquency is a serious social problem.
同根词:rejuvenate(v.返老还童)
9.juxtapose v.并放,并列(to place side by side)
词根记忆:juxta(接近)+pose(放)--挨着放--并放,并列
例:The central idea is restated and juxtaposed with evidence that might appear to contradict it.
10.kernel n.果仁(the inner part of a nut or seed);核心(most important part)
词根记忆:kern( =corn种子)+el--核心
例:Heating a wheat kernel destroys its gluten , a protein that must be present in order for yeast to leaven bread dough.
11.kidney n.肾脏
例:Desert rats kidneys can excrete a urine having twice as high a salt content as sea water.
12.kin n.集合词家属,亲戚(relatives)
例:Self-help and the help of kin got most workers through jobless spells.
派生词:kinship(n.亲属关系)
13.kinetic a.运动的(of, relating to, or produced by motion)
词根记忆:kinet(动)+ic--运动的
例:kinetic energy动能
同根词:kinescope(n.显像管);kinematics(n.运动学)
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