【英语时差8,16】背后的蓝色胎记

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.  

1 distinctive   

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   

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   

（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   

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   

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   

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   

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   

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   

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   

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   

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   

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   

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   

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。