Not only did he speak English well, but he spoke Japanese more easily. 他岂但英语说得好,就连日语也讲得满轻松自如。
He not only had read the book, but (also) remembered what he had read. 他岂但读过此书,还把所读的内容都记住了。
牛津高阶第八版
美国韦氏词典
Dictionary.com
Free Dictionary
维基百科 (自由的百科全书)