大学英语教学资料-genetic engineering and food security.pptVIP

Presentation 1. What do you think are the reasons why some people become addicted to drugs? Medical English: A Reading Course (I) Chapter 5Genetic Engineering and Food Security 1. Vocabulary: prefix 脏器方面的词根 2. Lead-in 3. Text analysis 4. Discussion Common Prefixes TABLE 1 Prefixes for Numbers PREFIX MEANING EXAMPLE DEFINITION OF EXAMPLE prim/i first primitive occurring first in time mon/o one monocular [m??n?kjul?] pertaining to one eye 单眼的;单目镜的〔显微镜〕 uni- one unicellular [?ju:ni?seljul?] Composed of one cell 单细胞的 hemi- half; one side hemisphere [?hemi?sfi?] one half of a rounded structure半球 TABLE 1 Prefixes for Numbers Continued PREFIX MEANING EXAMPLE DEFINITION OF EXAMPLE semi- half; partial semisolid partially solid半固体（的） bi- two, twice bicuspid [bai?k?spid] a tooth with two points (cusps) 两尖齿 di two, twice dimorphous [dai?m?:f?s] having two forms (morph/o) 二态的 dipl/o double diploid[?dipl?id] having two sets of chromosomes二倍体，倍数染色体 tri three triplet one of three offspring produced in a single birth TABLE 1 Prefixes for Numbers PREFIX MEANING EXAMPLE DEFINITION OF EXAMPLE quadr/i- four quadrant [?kw?dr?nt] one-fourth of an area 四分之一圆 tetra- four Tetrahedron [?tetr??hedr?n] a figure with four surfaces四面体 multi- many multiple consisting of many parts多重的；多个的 poly- many, much polysaccharide [p?li?s?k?raid] substance composed of many sugars多醣，聚糖，多聚糖 TABLE 2 Prefixes for Colors PREFIX MEANING EXAMPLE DEFINITION OF EXAMPLE leuk/o- white, colorless leukoplakia white patches in the mouth melan/o- black, dark melanin[?mel?nin] the dark pigment that colors the hair and skin黑色素 xanth/o- yellow xanthoderma [?z?nθ??d?:m?] yellow coloration of the skin黄色皮肤 cyan/o blue cyanosis [?sai??n?usis] bluish discoloration of the skin due to lack of oxygen发绀，苍白病，黄萎病 erythr/o- red erythrocyte [i?riθr?usait] a red blood cell红细胞；红血球 TABLE 3 Negative Prefixes PREFIX MEANING EXAMPLE DEFINITION OF EXAMPLE a-, an- not; without aseptic[??sept?k, e?-] free of infecti