The highest RR of leukemia was found in those who were engaged in X ray work before 1965 or at age under 20 years.
白血病的相对危险以1965年前开始放射工作和开始放射工作时年龄小于20岁者最高。
Half of the cases occurred in people under the age of 20 years; 90% of cases occurred in people under the age of 40 years.
半数病例发生在20岁以下的人中；90%的病例发生在40岁以下的人中。
Rates declined for all age groups under 20 years.
在不到20年的时间里，各个年龄组的出生率都下降了。
Overall it is estimated that half the global HIV infections have been in people under 25 years - with 60% of infections of females occurring by the age of 20.
据整体估计，全球一半以上的艾滋病毒感染者年龄在25岁以下——感染的女性年龄在20岁以下占60%。
For example, across Europe some 20 percent of those under 25 years of age are without a job, in countries harder hit by the economic crisis the rate is above 40 percent.
比如，在整个欧洲范围内，大约20%年龄在25岁以下的人们没有工作，而在受经济危机影响更大的国家，这个比率达到了40%以上。
For example, across Europe some 20 percent of those under 25 years of age are without a job, in countries harder hit by the economic crisis the rate is above 40 percent.
比如，在整个欧洲范围内，大约20%年龄在25岁以下的人们没有工作，而在受经济危机影响更大的国家，这个比率达到了40%以上。
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