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【英语时差8,16】背后的蓝色胎记

时间:2016-04-15 02:18来源:互联网 提供网友:yajing   字体: [ ]
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Parents of East Asian, East African and Native American descent are not usually surprised when their babies are born with distinctive1 blueish-gray or blueish-green birthmarks on their backside.  
 
Eighty to ninety-five percent of infants from these ethnicities bear the marks, and they are also quite common on Hispanic babies. The spots appear at the base of a baby's spine2 at birth or a few weeks afterwards, and usually fade after a few years. 
 
The birthmark is often called a "Mongol Spot" because in ancient times the trait was characteristic in Mongolian tribes. But as the Mongols merged3 with other populations, the trait became less pervasive4, and in some populations it is now undetectable. 
 
Although uncommon5 in Caucasian and other groups, a similar spot can be seen microscopically6 in all newborns regardless of race. The birthmark is produced in a deep layer of the skin by a large cluster of melanocytes--or pigment7 cells--formed from precursor8 cells that migrated into the skin during embryonic9 development. 
 
Sometimes the birthmarks are confused with bruises11 because the light scattering12 effect responsible for making a bruise10 look blue is the same reason why Mongol Spots look blue. The pigment for Mongol Spots is deep within the skin, so longer-waved light-- which appears as the color red--is absorbed. And shorter-waved light--that appears as blue--is reflected back to our eyes. 
 
Some cultures believe the spots are left from where the baby was prodded13 or slapped by a spirit to leave "pre-life" and be born, others say it's a sign of royalty14. In truth, they are congenital birthmarks.  

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1 distinctive Es5xr     
adj.特别的,有特色的,与众不同的
参考例句:
  • She has a very distinctive way of walking.她走路的样子与别人很不相同。
  • This bird has several distinctive features.这个鸟具有几种突出的特征。
2 spine lFQzT     
n.脊柱,脊椎;(动植物的)刺;书脊
参考例句:
  • He broke his spine in a fall from a horse.他从马上跌下摔断了脊梁骨。
  • His spine developed a slight curve.他的脊柱有点弯曲。
3 merged d33b2d33223e1272c8bbe02180876e6f     
(使)混合( merge的过去式和过去分词 ); 相融; 融入; 渐渐消失在某物中
参考例句:
  • Turf wars are inevitable when two departments are merged. 两个部门合并时总免不了争争权限。
  • The small shops were merged into a large market. 那些小商店合并成为一个大商场。
4 pervasive T3zzH     
adj.普遍的;遍布的,(到处)弥漫的;渗透性的
参考例句:
  • It is the most pervasive compound on earth.它是地球上最普遍的化合物。
  • The adverse health effects of car exhaust are pervasive and difficult to measure.汽车尾气对人类健康所构成的有害影响是普遍的,并且难以估算。
5 uncommon AlPwO     
adj.罕见的,非凡的,不平常的
参考例句:
  • Such attitudes were not at all uncommon thirty years ago.这些看法在30年前很常见。
  • Phil has uncommon intelligence.菲尔智力超群。
6 microscopically b95eb0161484f1e40de775b8b54c545f     
显微镜下
参考例句:
  • Microscopically the ores are medium grained to amorphous. 显微镜下,矿石为中粒至非晶质。 来自辞典例句
  • He studied microscopically the statistics of trade. 他极仔细地研究了贸易统计数字。 来自辞典例句
7 pigment gi0yg     
n.天然色素,干粉颜料
参考例句:
  • The Romans used natural pigments on their fabrics and walls.古罗马人在织物和墙壁上使用天然颜料。
  • Who thought he might know what the skin pigment phenomenon meant.他自认为可能知道皮肤色素出现这种现象到底是怎么回事。
8 precursor rPOx1     
n.先驱者;前辈;前任;预兆;先兆
参考例句:
  • Error is often the precursor of what is correct.错误常常是正确的先导。
  • He said that the deal should not be seen as a precursor to a merger.他说该笔交易不应该被看作是合并的前兆。
9 embryonic 58EyK     
adj.胚胎的
参考例句:
  • It is still in an embryonic stage.它还处于萌芽阶段。
  • The plan,as yet,only exists in embryonic form.这个计划迄今为止还只是在酝酿之中。
10 bruise kcCyw     
n.青肿,挫伤;伤痕;vt.打青;挫伤
参考例句:
  • The bruise was caused by a kick.这伤痕是脚踢的。
  • Jack fell down yesterday and got a big bruise on his face.杰克昨天摔了一跤,脸上摔出老大一块淤斑。
11 bruises bruises     
n.瘀伤,伤痕,擦伤( bruise的名词复数 )
参考例句:
  • He was covered with bruises after falling off his bicycle. 他从自行车上摔了下来,摔得浑身伤痕。 来自《简明英汉词典》
  • The pear had bruises of dark spots. 这个梨子有碰伤的黑斑。 来自《简明英汉词典》
12 scattering 91b52389e84f945a976e96cd577a4e0c     
n.[物]散射;散乱,分散;在媒介质中的散播adj.散乱的;分散在不同范围的;广泛扩散的;(选票)数量分散的v.散射(scatter的ing形式);散布;驱散
参考例句:
  • The child felle into a rage and began scattering its toys about. 这孩子突发狂怒,把玩具扔得满地都是。 来自《简明英汉词典》
  • The farmers are scattering seed. 农夫们在播种。 来自《简明英汉词典》
13 prodded a2885414c3c1347aa56e422c2c7ade4b     
v.刺,戳( prod的过去式和过去分词 );刺激;促使;(用手指或尖物)戳
参考例句:
  • She prodded him in the ribs to wake him up. 她用手指杵他的肋部把他叫醒。
  • He prodded at the plate of fish with his fork. 他拿叉子戳弄着那盘鱼。 来自《简明英汉词典》
14 royalty iX6xN     
n.皇家,皇族
参考例句:
  • She claims to be descended from royalty.她声称她是皇室后裔。
  • I waited on tables,and even catered to royalty at the Royal Albert Hall.我做过服务生, 甚至在皇家阿伯特大厅侍奉过皇室的人。
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