Life expectancy is an estimate of the average number of years a baby born in a particular year might expect to live. The measurement assumes death rates at the time of birth do not change. 预期寿命是对特定年份出生的婴儿预期寿命的平均年数的估计。该测量假设出生时的死亡率没有变化。 Life ...
[01:35.64]Life expectancy is one of the world's [01:38.96]most important health measures. [01:41.36]Still the life expectancy measurement has problems. [01:47.36]For example, life expectancy is an estimate [01:51.84]that ...
在家里,机器人会为你做家务,帮你捶背;椅子的颜色也能随心控制;衣服冬暖夏凉;最不可思议的是,汽车在天上飞翔,自由畅快 New time new life.The medicine along with the time development, in the future, humanity's mean lifetime will be able to achieve 120 years old.Science and technology along with ...
Life expectancy at birth for the world's population at the turn of the twenty-first century was 67 years, with females having a four-year advantage (69 years) over males (65 years); see Table 1. As expected, developed countries experience substantially higher life expectancy than less develop...
Human lifespan is a highly variable and heterogeneous trait1. Until the 19th century average life expectancy was∼30–40 years2. The sharp rise in life expectancy over the past century is due primarily to improved housing, nutrition, hygiene and vaccines3, which greatly enhanced the chances to...
Theory suggests that longer life expectancy encourages educational investment because a longer time horizon increases the value of investments that pay out over time. To estimate the magnitude of this effect, we examine a sudden drop in maternal mortality in Sri Lanka between 1946 and 1953, which ...
Life-expectancyDeficit accumulationMedical progressAlthough death occurs with certainty, the time of death is uncertain. In this paper we build on this conceptualization and show that, although life ends at some point in time, human life can be meaningfully conceptualized as a strive for immortality...
Learning was faster when the Pavlovian contingencies were trained before introduction of the instrumental response. The results support a cognitive model of anxiety in which performance of an avoidance response reduces expectancy of an aversive outcome and thereby reduces anxiety. 展开 被引量: 4 ...
If the research is confirmed by other studies, that could mean the limit of the human lifespan has yet to be reached. Life expectancy globally has risen almost continuously since the 19th century, but has leveled off in recent decades. Babies born in the United States today, for example, ...
【长难句解读】 Lifespan is the term used to describehow long an individual lives, while life expectancy is theaverage time of life that individuals in an age group canexpect to have.分析:这是一个复合句。how long引导宾语从句;that引导定语从句。while是并列连词,意为"而然而"。译文:平均寿命是...