自第一卷问世以来,已经过了五个春秋。在这五年中,世界各国有关儿少卫生学范畴的科研又有了新的发展。为适应这“知识激增”的年代,我们又组织力量撰写了第二卷。本书内容有涉及青春期生长发育的内分泌学、体质研究、微量元素对儿少健康的影响、儿童行为研究、双生子研究、模糊数学在儿少卫生学领域 Five volumes have passed since the first volume was introduced. In these five years, new developments have been made in the research on the areas of children’s hygiene in various countries in the world. To accommodate this “surge of knowledge,” we have also organized forces to write the second volume. The contents of this book are involved in adolescent growth and development of endocrinology, physical research, trace elements on children less health effects, children’s behavior research, twin studies, fuzzy mathematics in children less hygiene field