You know, he's a damn good letterer…

你知道他是个很好的文字书写员…

It describes a spectrum of disease ranging from isolated eosinophilic granuloma to disseminated Letterer-Siwe disease.

它表现为一系列的病变，从孤立性的嗜酸性肉芽肿到弥散性的莱-赛二氏病。