scalability 该怎么翻译？ extensibility 呢？

jcip 里 scalability 的定义: Scalability describes the ability to improve throughput or capacity when additional computing resources (such as additional CPUs, memory, storage, or I/O bandwidth) are added.

维基百科上 extensibility 的定义: Extensibility is a software engineering and systems design principle that provides for future growth. Extensibility is a measure of the ability to extend a system and the level of effort required to implement the extension. Extensions can be through the addition of new functionality or through modification of existing functionality. The principle provides for enhancements without impairing existing system functions.

都翻译成“可扩展性”吗？