instruments

http://www.cocoachina.com/industry/20140114/7696.html
http://www.cnblogs.com/iOSv587country/p/4862989.html
http://blog.csdn.net/MinJing_Lin/article/details/51671229
https://blog.leancloud.cn/2835/?hmsr=toutiao.io&utm_medium=toutiao.io&utm_source=toutiao.io&from=timeline&isappinstalled=0

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