Though in early childhood the spleen may be enlarged with sickle cell anemia , continual stasis and trapping of abnormal rbc ' s leads to infarctions that eventually reduce the size of the spleen tremendously by adolescence 虽然在儿童早期镰状细胞贫血可导致脾增大，但在青春期由于异常的rbc持续的郁积和阻塞，引起脾梗死，脾体积明显缩小。
Medical news today : us scientists have shown that if a girl is overweight before she is a teenager , she is more likely to be obese and have a higher risk of heart disease as a woman 今日医学新闻：美国科学家已向社会公布他们的研究成果：女孩子在青春期以前即表现超重者，将来变成女人以后就很可能患肥胖症，而且得心脏病的危险程度会更高。
It usually starts at teenage and begins to improve gradually after 20 years of age . however , some people may still have acne in their early 30 s . treatment of acne depends on the type and the severity of the disease . 1 寻常痤疮( acnevulgaris )俗称暗疮或青春豆，通常在青春期开始发病，约二十岁后开始改善，但年近三十岁才发病的个案也不少。
A study in 1997 , for example , looked at thousands of twins and found that 10 percent to 15 percent of the subjects had gradual changes in eye color throughout adolescence and adulthood , which occurred at nearly identical rates in identical twins 科学家在1997年对数千对双胞胎研究后发现， 10至15的双胞胎同时在青春期和成年后眼睛颜色会逐渐改变，这证明，有相似基因的双胞胎发生眼睛变色的几率也是相同的。
A study in 1997 , for example , looked at thousands of twins and found that 10 percent to 15 percent of the subjects had gradual changes in eye color throughout adolescence and adulthood , which occurred at nearly identical rates in identical twins 例如，科学家在1997年对数千对双胞胎研究后发现， 10至15的双胞胎同时在青春期和成年后眼睛颜色会逐渐改变，这证明，有相似基因的双胞胎发生眼睛变色的几率也是相同的。
