unsolved造句
Ruralpovertyandchronicallydistressedregionscontinuetopresentpolicymakerswithunsolvedproblems."Thisisoneoftheunsolvedmysteriesoflong-distanceflights,"Klaassensaid.Hisresortburneddownin1994-anunsolved...
相关unsolved的文学知识
unsolved problem造句
Thisisanunsolvedproblem.Inheritancetheoryofontologiesisaveryimportantunsolvedproblem.However,themostprofoundunsolvedprobleminbiologyistheoriginoflifeitself.Intheendtheunsolvedproblemandgoing-ondirecti...