出难题偏题
raise out-of-the-way and catchy questions
故障位置难题
FLP Fault – Location Problem
环保难题
the difficult problem of environmental protection
计算Diffie-Hellman CDH难题
computational Diffie-Hellman CDH assumption
技术理论难题
theoretical and technical difficult problems
交错线难题
patterned-strings problem
离散对数难题
discrete logarithm problem
李约瑟难题
needham question
The Ncedham’s puzzle
joseph needham problem
Needham’s Difficult Question