On the other hand, one has to admit also that the underlying reasons could be manifold, as the changes undergone and challenges faced by the world over the last decade are indeed complex both in nature and in scope.
另一方面，人们也必须承认，潜在原因可能是多方面的，因为世界在过去十年经历的变化和面临的挑战在其性质和规模上确实十分复杂。