贵校如何用英文表达？

your school.

中文喜欢用空而华丽的字句．

相对应的英文却多数简单明了．

your school就可以

noble school贵族学校

贵校
your exalted school (exalted adj. 尊贵的, 高位的, 高尚的)

在信中写署名的话,用your school就OK了.

your school

of an honored rank or position school