图书漂流的目的是跟踪图书在世界各地的流动，并且与陌生人分享资源。
The purpose of BookCrossing is to track books across the world and to share great literature with strangers.
目的：探讨高度近视眼后巩膜形态改变与眼轴长度、近视程度及血流动力学变化之间的关系。
Objective: To explore the morphological changes of rear sclera in myopia and the relation among the length of eye axis and the degree of myopia and hemodynamic changes.
目的探讨流动人口子女父母教养方式与学习环境适应性的关系。
Objective To study the correlation of floating population childrens parental rearing pattern and Learning environment adaptability.
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