Supposed by the National High-Tech Research and Development Plan of China under Grant Nos.2007AA010301;2006AA01Z19A (国家高技术研究发展计划(863));the National Basic Research Program of China under Grant No.2005CB321803(国家重点基础研究发展计划(973));the National Natural Science Funds for Distinguished Young Scholar of China under Grant No.60525209(国家杰出青年基金)