一位听众来信询问单词 “brochure、leaflet” 和 “pamphlet” 之间的区别。这三个词所指的物品都属于 “印刷品”，但外观和用途有所不同。从外观上看，“brochure” 通常最厚，其次是 “pamphlet”，最薄的是 “leaflet”。在这三个词所指的 “册子” 中，哪个 “册子 ...

CHICAGO, IL— In a study of the natural history of leaflet thrombosis and abnormal motion in aortic bioprosthetic valves, approximately one-third of patients developed some degree of subclinical ...