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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 | 
