1. We are grateful to the chief editor and anonymous reviewers for illuminating comments. this research was mainly supported by “the key project of chinese national programs for fundamental research and development (973 program, 2010CB950702)”, the china's high-tech special projects (863 PLAN, No. 2007AA10Z231), and apn project (ARCP2010-14NMY-LI).*Jianlong LI is considered as corresponding author.
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