Acne is triggered by puberty hormones.
青春痘是由青春期激素引发的。
Natural weight gain and other changes caused by puberty.
发育期所带来的体重自然增加以及其它变化。
By puberty, the gametes will have further reduced to perhaps three hundred thousand, and only three hundred will ever have the chance of being viable.
到青春期时，这些配子将继续减少到三十万，而且只有三百个具有生育能力。
For example, the cognitive changes are initiated by physical changes; and, during puberty both physical and emotional development occurs.
例如，认知变化是由身体变化引起的；并且，在青春期内，身体和情感的发育是同时发生的。
Although the most common cause of gynecomastia is puberty, it can sometimes be caused by certain diseases or side effects of some medications.
通常情况下造成男性女乳症的原因是因为青春期发育的关系，但是有时候也可能是因为某些疾病或药物的副作用。
According to a study published in the journal Pediatrics last year, 15 per cent of American girls have begun puberty by age seven.
根据去年《儿科杂志》上的一项研究，百分之十五的美国女孩七岁就开始了青春期。
It showed that the age of puberty had dropped by three and a half months over 15 years, reinforcing the results of the choirboy study.
结果表明，男童的青春期年龄在过去15年已经下降了三年半，再一次印证了对唱诗班男童的研究。
While new language learning is easiest by age 7, the ability markedly declines after puberty.
7岁之前容易掌握第二语言，青春期之后这种能力明显逐渐下降。
Puberty is characterized by nervousness, sensitivity and irritation.
处于青春期的人往往都易于紧张、敏感和烦躁。
By measuring the skinfold thickness of triceps and subscapular, this paper studies the effects of physical exercise on body composition of girls during puberty.
通过测量肱三头肌位和肩胛下角位皮褶厚度，分析身体组成，探讨健身运动对青春期女孩发育的影响。
However, they also accept that the onset of puberty is influenced by factors such as nutrition and exercise, and the effect of a single gene is likely to be relatively small.
然而，他们也认为青春期的开始也受到营养和运动等因素影响，单个基因的影响相对而言还是很小的。
However, they also accept that the onset of puberty is influenced by factors such as nutrition and exercise, and the effect of a single gene is likely to be relatively small.
然而，他们也认为青春期的开始也受到营养和运动等因素影响，单个基因的影响相对而言还是很小的。
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