里普利引用了著名社会学家詹姆斯·科尔曼的著作，科尔曼在教育方面的研究是开创性的。
Ripley cites the writings of renowned sociologist, James Coleman, whose research in education was groundbreaking.
教育政策中心引用的数据显示，美国各州的男孩在阅读方面落后于女孩。
The Center on Education Policy cites data showing that boys lag girls in reading in every American state.
这些图持有弱引用，允许连接这样的被跟踪对象在只有方面引用它们的时候，被垃圾收集掉。
These maps hold weak references to allow tracked objects like connections to be garbage collected when they are referenced only by the aspect.
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