权威例句
Orbifold Gromov-Witten TheoryOrbifold resolution by D-branesMembranes on an orbifold.A New Cohomology Theory of OrbifoldThe operator algebra of orbifold modelsStrings in a Time-Dependent OrbifoldFive-branes and M-theory on an orbifoldInstability of Spacelike and Null Orbifold SingularitiesLimits on extra dimensions in orbifold compactifications of superstringsHeterotic strings in symmetric and asymmetric orbifold backgrounds