Wednesday seemed like any other morning for Rajendra Dawadi, the principal of a school in Nepal. 对尼泊尔一所学校的校长拉金德拉·达瓦迪来说，上周三早晨似乎与往日无异。 “Everything was going normally,” he said. “一切都很正常，”他说。 That changed around 9:10 a.m., when Mr. Dawadi was teaching a class…