理学 系统兼容性 释 downward compatibility 向下兼容 为旧版本软硬件环境所创建的程序能够在新版本软硬件环境中运行，或者旧版本程序产生的数据和文档能够被新版本程序使用。又称向后兼容（backward compatibility）、回溯兼容。
软件工程 释文 downward compatibility 向下兼容 软件工程 释文 downward compatibility 向下兼容
- bulk yarn
- bulky ligand
- bullbourethral gland
- bull city
- bulldozer
- bulldozers
- Bullen Keith Edward
- Bullet Cluster
- bullet cluster
- bulletin
- bulletin board
- bulletin board system
- bulletin board system, BBS
- Bulletin by Temporary President of the Republic of China
- Bulletin of Environmental Status of China
- Bulletin of Flood and Drought Disaster in China
- Bulletin of Geological Science and Technology
- bulletin of land and household tax collection
- bulletin of marine disaster
- Bulletin of The Astronomical Society of India
- Bulletin of the History of Medicine
- Bulletin of the Library Association of China
- Bulletin of the Museums Association of China
- Bulletin of the Seismological Society of America
- Bulletin on God-Thanking Opera by Li Wenmao the King of Pacification