opaque type

基本解释

Unlike the other two, this is not an opaque type; its structure is documented.
與另外兩個數據類型不同，這是一個透明的類型；其結搆在文档中有介紹。
The binaryvar data type is a variable-length opaque type with a maximum length of 255 bytes.
binaryvar 數據類型是一種變長的 opaque 類型，最大長度爲 255 字節。
Lacquerwork: Any of a variety of decorative objects or surfaces, usually of wood, to which a coloured, highly polished, and opaque type of varnish called lacquer has been applied.
漆器：表麪塗有彩色、高度磨光的不透明漆的裝飾性對象的統稱，通常爲木制。