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49.self-：by means of oneself or itself；of，to，with，for，or in

oneself or itself

employed--self-employed

taught--self-taught

50.semi-：half；partly

circle-semicircle半圆形

final-semifinal半决赛

51.step-：not by birth but through a parent who has remarried

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mother-stepmother继母

children-stepchildren养子

52.sub-：under，below；less important；part of the stated bigger

whole

divide-subdivide再分，细分

section--subsection分部,分段,小部分,小单位,细分

53.super-：more，larger，greater than usual

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market-supermarket超市

natural-supernatural超自然的，超自然的现象

54.tele-：at or over a long distance；by or for television

communication-telecommunication电信

screen--telescreen

55.therm(o)-：concerning heat

chemistry--thermochemistry

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meter-thermometer 温度计

56.trans-:  across, on or to the other side of ; between

Atlantic-transatlantic电视屏幕,荧光屏

plant-transplant移植

57.tri-:  three; three times

angular-triangular 三角

cycle-tricycle三轮车,机器三轮车

58.ultra-:  beyond; very, extremely

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modern-ultramodern超现代化的

sound-ultrasound超声，超声波

59.un-:  not

certain-uncertain不确定的

fortunate-unfortunate 不幸的，不幸的人

60.under-:  too little; below

develop-underdevelop(使)发展不完全,(使)显影不足

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sea-undersea海面下的

61.uni-:  one, singer

form-uniform制服，相同的，清一色的

directional-unidirectional单向的，单向性的

62.vice-:  next in the rank; below

chairman-vice-chairman 副委员长

president-vice-president副总统，副校长

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