喜从天降xǐcóngtiānjiàng[happiness comes from Heaven] 形容遇到意想不到的喜事,感到极度高兴贵脚踏贱地,使下官喜从天降。——元·马致远《青衫泪》喜不自胜，喜不自禁xǐbùzìshèng,xǐbùzìjīn[unable to contain oneself