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Glass appears to be an ordinary material with wide applications in daily life and industry;however, its formation mechanism, phase transition and microscopic structure remain mysterious.It is accepted to be an amorphous solid exhibiting glass transition, with short-range (＜6-8 (A)) order, but long-range (＞ 20(A))disorder structures [1].Experimental determination of the structure of glass is crucial to understand its dynamic and physical properties.'What is the nature of glass?'is one of the most fundamental and challenging scientific questions [1].