Watching television more than two hours a day early in life can lead to attention problems later in adolescence, according to a study released on Tuesday.

据本周二公布的一项研究结果，儿童时期每天看电视超过两小时会导致青少年时期出现注意力问题。

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Both the prenatal period and adolescence are critical times in brain development and smoking has been linked to memory and attention problems in teens.

在孕期和青春期对于大脑的发育是关键时期，吸烟与十几岁的青少年在记忆力和注意力上出现的问题有关。

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At present, a number of enterprises are or will be in their "adolescence", which may bring about many particular problems such as the sharp expansion of various risks.

当前，一大批企业即将进入或已经处于“青春期”，面临着诸多青春期问题，各种风险陡然增加。

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But they produce children who learn better, develop critical life skills, have fewer problems in childhood and adolescence, commit fewer crimes, earn more money, and just generally live happier, stabler, more productive lives.

FORBES: The Importance of Early Childhood Intervention on Student Achievement

Many psychiatric disorders that are thought of as problems of adulthood actually often arise for the first time in adolescence and by examining the scans of his volunteers Prof Bullmore hopes to learn whether at their root these conditions are abnormalities in brain development.

BBC: Brain scan study to understand workings of teenage mind