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A human hair consists mainly of a protein called Keratin. It also contains some moisture and the trace metals and minerals found in the rest of the body.

　　人类的头发主要由一种叫角朊的蛋白质构成，并富含水分及在身体别的有些也可找到的微量金属和矿物质。

　　● The only living part of hair is underneath the scalp--when the hair had grown through the scalp it is dead tissue.

　　头发仅有有生命的有些是在头皮下面，当它长出头皮时便变成无生命安排。

　　● Hair’s natural shine is supplied by its own conditioner, sebum, an oil composed of waxes and fats and also containing a natural antiseptic that helps fight infection. Too much sebum results in greasy hair and conversely, too little sebum makes dry hair.

　　头发的天然光泽来自它自身的护发素：油脂，它富含蜡和脂肪，还富含抗感染的天然抗菌剂。油脂含量过多会致使油性发质，相反，油脂含量过少则会致使干性发质。

　　● Hair grows about 12 mm per month. If a person never has his hair cut, it would grow to a length of about 108 cm before falling out. Hair grows faster in the summer and during sleep. A single strand lives for up to seven years.

　　头发每个月可长12毫米，假如一自己从不剪发，头发会长至108厘米才开端掉落。在夏天和睡觉的时分头发生长得较快。一根头发的寿数可长达7年。

　　● Healthy hair is highly elastic and can stretch 20 or 30 per cent before snapping. A human hair is stronger than copper wire of the same thickness. A combined strength of a headful of human hair is capable of supporting a weight equivalent to that of 99 people.

　　健康的头发十分赋有弹性，可拉长20%或30%而不断。一根头发比平等粗细的铜丝还要健壮。满头头发合在一起的力气可经得起99自己的分量。

　　● Scandinavians normally have thin, straight, baby-fine hair, and mid Europeans hair that is neither too fine nor too coarse. People native to the Indian subcontinent have coarse textured tresses while Middle Eastern populations have strong hair. The hair of Chinese and Japanese people is very straight; that of Latin-speaking and North African peoples can be very frizzy and thick.

　　斯堪的纳维亚人的头发又细又直，像婴儿的头发相同;中部欧洲人的头发不细不粗;印度次大陆人的头发粗且打绺;中东人的头发都很健壮;我国人和日本人的头发十分直顺;而拉丁语国家及北非区域的人头发弯曲而稠密。

　　Notes:

　　scalp [sk lp] n. 头皮;战利品

　　conditioner: 护发素

　　antiseptic [, nti'septik] adj. 防腐的，抗菌的;十分整洁的n. 防腐剂，抗菌剂

　　copper wire : 铜线

　　Scandinavian [,sk ndi'neivi n; -vj n] n. 斯堪的纳维亚人

　　coarse texture粗结构

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