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假设你能够把今天美国的每一个人都拍进一张大的团体照里,那么你就会发现照片里的女性要比男性多600万。在这个国家妇女要比男人多活7年左右。在整个现代世界里文化、饮食、生活方式和死亡原因都有所不同,但是有一种情况始终没有变化——女人比男人活得时间长。这种情况出生前就开始了。怀孕时,男性胎儿比女性胎儿约多100～110;出生时,男女比例已降低到约105:100。到了30岁,剩下的男人数与女人的数相近。在这以后,女人开始领先。在超过80岁时,女人将近是男人的两倍。
Suppose you were able to take everybody in the United States today in a big group photo and you find that there are 6 million more women than men in the photo. Women in this country have to live more than men for about seven years. There are differences in culture, diet, lifestyle, and causes of death throughout the modern world, but one thing remains the same - women live longer than men. This situation began before birth. When pregnant, the male fetus is about 100 to 110 more than the female fetus; at birth, the male / female ratio has been reduced to about 105: 100. By the age of 30, the number of remaining men and women are similar. After that, the woman started to lead. At the age of 80, women are nearly twice as likely as men.